Sexual indiscretion is not the same as murder. Obviously both are wrong, but you can't be serious when you construct a straw man argument against CC by claiming that some guy in a minivan is going around giving people undeserved and unscreened permits. Firearms instructors are not the people who issue permits.
State and local law enforcement authorities, in my state the chief of police is usually the one who has the final say in the permit process, it is a shall issue state so anyone who completes the requirements and meets the eligibility standards will be issued a permit.
This is a much better system than the inherently corrupt may-issue system in place in states such as California, where the issuing authority can refuse to issue a permit for any reason they like or no reason at all. Frequently the Sherriff will issue permits only to rich, famous, influential, and people who donate to his re-election campaign. Since the system is may-issue, it is nearly impossible to do anything about it, so ordinary people who want to exercise their right to self-defense are denied that ability while people who do favors for the Sherriff are given permits without any trouble.
"you has a permit, you can bring a gun to school" is ludicrous.
Do you have any familiarity with CC permit process? It involves a lot more than just heading down to the corner and picking one up for fifty bucks from ole Grungy Dave.
Just thinking about having to actually use a handgun in a school setting with all the priceless, irreplaceable students standing behind the next wall, or around the next corner, makes me sick to my stomach. The person carrying the gun would have to be more highly trained than any SWAT officer, than any Navy Seal to be able to operate in such an innocent-dense setting safely. The few days of "training" that the state would obviously have to set up to register these people to carry in schools, would be just enough to get innocent students shot in the process of trying to stop an attack.
You don't think that the level of concern teachers in general have for their students would make them
more careful and more safety-conscious? Teachers have stopped school shootings on more than one occasion, one of the noteworthy incidents the vice principal had to run all the way to his vehicle off school property to retrieve his pistol, he made it back just in time to stop the student who was shooting and hold him for police. The shooter had a plan, it was to shoot a few people at his school then head across town to the middle or elementary school since police would be at the high school helping his earlier victims and looking for him. If the vice principal had been able to discretely carry his pistol at work, there is the very real possibility that the shooting would have stopped sooner.