On Tuesday night, the mother of Trayvon Martin praised Hillary Clinton at the Democratic National Convention in Philadelphia for having “the courage to lead the fight for common-sense gun legislation.”  Numerous other speakers also raised the gun control issue at the DNC, too.  But Wednesday night was clearly “gun night.”

From Senator Chris Murphy (D-Conn.) to former Philadelphia Police Commissioner Charles Ramsey to former Representative Gabby Giffords and her husband, NASA Astronaut Mark Kelly to others, a string of speakers pushed for more gun control.  When President Obama addressed the crowd he also pushed the notion of changing background checks on guns.

Hillary Clinton spoke about how “We should be working with responsible gun owners to pass common-sense reforms and keep guns out of the hands of criminals, terrorists and all others who would do us harm,” on Thursday night.    

Democrats are angry about what they claim to be mass, systematic racism by the police.  But they overlook the discriminatory effects of background checks.  These regulations disproportionately prevent law-abiding black and Hispanic males from getting guns.

It is President Obama’s theme in each of his speeches after mass public shootings.  Hillary Clinton has regularly made the same claim during her presidential campaign.

In June, ABC’s Jon Karl asked Murphy a simple question about his legislative proposal for background checks on private transfers of guns: “So why -- why are we focusing on things that have nothing to do with the massacres we're responding to?”  Murphy couldn’t point to a single mass public shooting that would have been stopped by his bill.  Indeed, I checked back to 2000 and also could not find a single such shooting.

But it is worse than that.  In my new book, “The War on Guns,” I show that the European Union’s 28 member nations already have these background checks on private transfers.  Yet, they suffered a 50 percent higher casualty from mass public shootings than did the U.S.  From 2000 to 2015, the U.S. states with these background checks also experienced higher frequencies of mass public shootings.  They also had more injuries and deaths from these attacks.

Instead of additional background checks and creating problems for more law-abiding citizens, let's acknowledge and fix the broken system that we already have. Virtually everyone who fails a background check is someone who is legally eligible to buy a gun.  Law-abiding minorities, particularly blacks, are the ones most likely to be stopped from buying guns.

Hillary Clinton claims that background checks have stopped 2.4 million dangerous or prohibited people from buying a gun.  But what she ought to say is that there were 2.4 million “initial denials.”

These initial denials are akin to being stopped from flying because your name is similar that of someone on the No Fly list. This happened five times to the late Sen. Ted Kennedy.  By Hillary Clinton’s method of counting, five terrorists were stopped from flying.

About 96 percent of “initial denials” are dropped after the first two stages of review.  Many more are dropped during the three remaining stages.

Bill Clinton, George W. Bush, and President Obama have all been criticized for not prosecuting prohibited purchasers. In 2010 (the year of the last full, annual report on the Brady Act), 76,152 denials resulted in only forty-nine federal prosecutions. State prosecutions were also few in number.

But there wasn’t really any failure to prosecute. The vast majority of these denials were not real cases. Sharing a name and birthdate with a felon isn’t the same thing as actually being a felon.

Certain racial groups will encounter this problem more often than others. With some 40 percent of Vietnamese people bearing the name Nguyen, the problem of duplicate names is very likely to exist among people with this national heritage.  Hispanics are more likely to share names with other Hispanics, and the same is true of blacks. Also, because 30% of black males are forbidden from buying guns because of their criminal records, law-abiding black males are especially likely to have their names confused with those of prohibited people.

For many of these 2.4 million people, a mistaken denial might be a mere inconvenience. But some people really do have an urgent need to protect themselves from stalkers or enemies.

The solution? Hold the government to its own standards — the same standards that private companies are held to. Private companies would be sued out of existence for making even a tiny fraction of the government’s mistakes. Moreover, the current government system is clearly unfair to certain races.

The Obama administration hasn't done anything to fix this system. Indeed, it has pulled everyone off of checking for mistakes.  It is difficult to appeal denials without the help of a lawyer, and few poor minorities can afford to pay thousands of dollars in legal fees.

 Gun buyers and sellers are stuck with all of the fees for universal background checks. In New York City and D.C., these fees are at least $125.  In Washington state and Oregon, the costs of transferring a gun are about $60 and $55, respectively.

But background checks are supposed to benefit everyone, so why not pay for them out of general revenue? It isn’t as if gang members are the ones paying the fees. These are law-abiding citizens who may really need a gun for protection. Some of them are poor people living in high-crime urban areas. Often, the most likely victims of violent crime can least afford these costs.

Paying for these background checks out of general government revenue would not only be fair, it would go a long way toward putting opponents’ minds at ease. This should be an easy fix, but gun control advocates seem to be hell-bent on increasing the costs of owning a gun. They're the ones who are unwilling to compromise on this issue.

It’s almost as if some Democrats want to use these fees to disarm poor minorities — the very people who are the most likely victims of violent crime.  In 2013, Republican legislators in Colorado proposed to exempt people below the poverty line from paying the new state tax on background checks.  In the Colorado House of Representatives, all but two Democrats voted against the amendment.

Democrats not only keep pushing a dangerously flawed background check system, they have also consistently opposed fixes that would make the system less discriminatory against minorities.  They ignore academic studies which show the ineffectiveness of background checks on private transfers.

These rules are clearly designed to reduce gun ownership. This time, bleeding-heart liberal Democrats don’t seem to care if the poor are disproportionately affected.

John R. Lott, Jr. is a columnist for FoxNews.com. He is an economist and was formerly chief economist at the United States Sentencing Commission. Lott is also a leading expert on guns and op-eds on that issue are done in conjunction with the Crime Prevention Research Center. He is the author of nine books including "More Guns, Less Crime." His latest book is "The War on Guns: Arming Yourself Against Gun Control Lies (August 1, 2016). Follow him on Twitter@johnrlottjr.