Quite a number of people do just that.
........just as it is not practical to carry a gun to the classroom for that one in a million chance that some wacko will randomly gun down 30 people."
A good friend of mine worked at a major university. She carried EVERY DAY.
" A random act of terror by someone who is willing to die is near impossible to prevent. The alternative is for everyone to be armed and on the lookout all the time."
You obviously don't understand the concept of "deterrence". Criminals are deterred by the uncertainty that they will be able to carry out their crime(s). Allowing CCW increases that uncertainty, and thereby deters at least SOME of them. And "some" chance of self defense is infinitely better than NO chance of self defense.
Let those who decide to qualify for CCW carry anywhere they want to. Eliminate ALL "gun-free" zones. Gun owners with CCW have proven their reliability in multiple states over years of time.
In the state of Tx I believe the rate of CC holders who commit a crime with a firearm is like .04%