When I was in high school, kids would fight. It'd get pretty bad, rivalries, bad blood etc, it easily could have or would have escalated to gun violence if guns were readily available, but only in the very extreme cases. That is one reason I don't want to raise children in the USA. It's not okay and it's not normal for kids being murdered in school because of a disgruntled student or employee. Kids just take it to the extreme, for whatever the reason it's a method of self-expression to murder the students or try to burn down the school.
I couldn't imagine the pain of having a child and then immediately not because of gun violence. Kids get murdered by stray bullets in the city of Chicago, what is this war zone? It's not on for me. It's the one thing I will never accept as a normality.
It's the people that @Eco mentioned that I'm least worried about, the hunters, the 1776ers, the recreational shooters etc. They typically practice safe gun techniques, take care of their weaponry, and for the most part store them securely. It's their kids and other family members I worry about, one bad day or several in a row and they know where they can get a gun, probably not use it properly and cause serious harm to others.