I'm not condoning it.... however.... some people may be of the mind that if and fact it becomes necessary and saves either their own life, their loved ones or another.... damn the legal repercussions. It's worth the cost.What you are suggesting is against the law. In other words you are suggesting that we become criminals. What makes you think that you would not be prosecuted, even if your use of force was undisputedly justified and in the eyes of some you were a hero? I do not have a problem ignoring signs that lack a legal enforcement provision. But schools and post offices are different.
Just sayin... alive and in jail beats your loved one 6' under.