A new law in the Lone Star State allows certain students to bring guns into college classrooms -- and supporters of the law say that in an age of mass shootings, concealed weapons are a preventative measure.

So, in essence, college and university students in Texas will now have a fighting chance should an armed killer bent on wreaking death and chaos perpetrate an attack on their campus.

The new state "campus carry" law, which went into effect Monday, allows people ages 21 and older with a concealed handgun license to carry pistols in classrooms and buildings throughout public colleges.

The law took effect on the 50th anniversary of one of the deadliest U.S. shootings to occur on a college campus -- in 1966, a student named Charles Whitman killed 16 people by firing from the clock tower at the University of Texas at Austin, the state's flagship public university.

Enrollment at UT now sits at over 214,000.

One Lubbock, Texas, father and grandfather supports the new concealed-carry law. "In this day and age -- I've got grandkids ages four and two who I worry about every day -- this allows students on campuses a fighting chance," he said. "I'm sorry, but have our leaders given us any reason to assume that violence will somehow stop, or even slow down, in America? If violence ramps up, personal defense must ramp up, too. We have rights guaranteed to us under the Constitution."

Republican Texas Gov. Greg Abbott supports campus carry as well. "What campus carry does is that it only authorizes those who go through the special training and background" to carry firearms, he was quoted as saying, according to Reuters.

A 30-year-old landscaping company manager in Murfreesboro, Tennessee, told LifeZette that just knowing college students might be carrying could possibly deter a shooter from taking the risk of opening fire.

"Look, since when is it bad to defend ourselves?" he said. "The more people who are armed legally and trained responsibly, the safer we all are. There won't be young kids carrying guns with the law -- you have to be 21 to even qualify to carry. And maybe that shooter will just think twice."

University of Texas professors lobbied to prevent the law, arguing that the combination of youth, firearms, and college life could make for a deadly combination, according to Reuters. University President Gregory Fenves reluctantly allowed campus carry, saying he was compelled to do so under the new law.

Last month, three professors filed a lawsuit to block the law, saying it could have a chilling effect on academic freedom.

"That is rich," said the landscape manager, laughing. "'Academic freedom'? What about the micro-aggressions that stranglehold students who can't make a move without being pegged as intolerant? I am suspect of anything a liberal professor says today about society, frankly."

Texas Attorney General Ken Paxton, a Republican, said the law is constitutionally sound and that he would defend it.

The law allows private colleges to opt out, and most of Texas' higher-profile private universities have done so, saying the measure does not protect student safety.

One hopes their opinions will never be tested with a real-life shooting by an armed killer bent on extinguishing as many lives as possible. There were 23 college campus shootings in 2015 alone.

Texas joins seven other states that allow people to carry concealed weapons on public post-secondary campuses. They are Colorado, Kansas, Oregon, Utah, Mississippi, Wisconsin, and Idaho.