There are a few tens of millions of legally owned semi-automatic rifles in the US.  99.99999% of those have never been used in a crime. You are more likely to be killed by a baseball bat than by a rifle in the US.

Tens of millions of people purchased these rifles at a typical cost of $1,000. Obviously they purchased these for reasons other than “killing people.” They are used for recreation, as well as being an fantastic crime and tyranny deterrent.

Schools need security, and it is a travesty that many don’t. Destroying the Bill of Rights is not a solution, and not an excuse for lefties to be idiots.