It also allows everyone else access to a very lethal one to stop someone who doesn't care whats legal or rational.
Well, close but not completely true. It does not allow everyone; and in fact in quite a few of the cases we learned that they didn't acquire them legally.
We've now had a great day of discussion about this topic. Here's what common sense tells us:
1. The toothpaste is out of the tube with regards to guns in the USA. You are simply not going to confiscate all of them and take them all off the street. You're not going to make criminals out of 33 million people overnight. Besides, you're not going to be able to do it at the Federal level as it would be unenforceable. And you can't do it at the State level due to the 14th Amendment (Equal Protection Clause). So forget the idea.
2. There are existing laws in place that - if enforced - would diminish the amount of gun violence. The problem is that we don't have the judicial backbone to go after the criminals with the guns. It would require police sweeps that would most likely be illegal themselves. As much as we want to defend the 2nd Amendment, we must equally defend the 4th Amendment.
3. You can't simply declare "Gun Free Zones" and expect them to work. If it did, we'd have "Hurricane Free Zones" here in Florida. We see that they don't work, and in fact create a horrible sense of false security.
4. Someone mentioned that placing police in schools is great, but we couldn't afford it. So what's the next best option? We have to harden the schools. Controlled access. Metal detectors. Random searches of backpacks. Minimize access points into the facility. I am reading today that the police wouldn't enter the school despite parent's pleas. This is horrible. This happened with the Parkland School shooting here in Florida. The police officer wouldn't go into the school to engage the shooter. In these cases I don't know how motivated the officers were to jump into it. I know I read that one police officer lost a daughter in the shooting. This was a case of where seconds counted, the police were minutes (or in this case an hour) away. There's got to be another way. If arming teachers isn't the way, then vet and train some of the parents and let them do their turn in the school. 3 or 4 parents in a school will have much more skin in the game than some security guard. It really comes down to a question of "How good do you want to feel?". We can do anything - just send money.
5. When (if) a child displays traits that are troubling, get the parents involved. Get the child's medical doctor involved. There have been plenty of the so-called "red flags" in most of these cases. We need to drill down into why no action was taken with apriori knowledge. I think this is a key point.
There are no doubt other points to consider but these are my Top 5. None of them involve changing the 2nd Amendment; it's not the problem here.