When looking for the "cause" of mass shootings in our schools, the 1st step is to realize there is not A single cause but rather a group of causes.
Look at it this way. Charcoal is harmless, So is Sulfur. So is Potassium Nitrate. What happens when you combine them in exactly the right proportions ? You get GUNPOWDER. It is the same with disturbed people. No one single cause, but a multitude of causes.
Anyone who wishes to kill, is going to find a way. No guns ? No problem. Just make a bomb. All of the information on bomb making is on the www.
I ask again, what has changed since you and I went the school ? Did we have violent video games or any video games for that matter ? No.
When we came home from school our mothers were waiting for us. That is not necessarily true today.
When we went to school, drugs were unheard of, at least during the 1950's and early 1960's. Not true today ! Any 7th grader can easily get his/her hands on any drug they want.
When we went to school our parents laid down strict rules for what we could and could not watch.
When we went to school there was no such thing as a computer or the www where any child can now easily watch the most violent, hate filled, material imaginable.
When we went to school we required to do chores around the house: mowing the lawn, raking the leaves, washing dishes, helping mom wash the windows, etc etc (Jeez, did I ever hate that one. But I obeyed). Todays kids often never lift a finger around the house. They are catered to.
When I was a kid I had a paper route and I shoveled snow in the winter and mowed lawns in the summer to earn my money. Todays kids often are given money as a matter of routine.
When we were kids we were well trained in the basics of civilized behavior. Is that true today ? Not in my opinion.
When my mom found a few bits of tobacco in my shirt pocket, I was in BIG trouble. Not today.
As an adult I watched a single parent mother coddle her son. He was given anything he wanted, anytime he wanted it. When she found out he was selling marijuana, she did nothing. When the police came to her house and told her that her son was caught shop-lifting, she did nothing. This went on for years and years. Sadly he became a full-blown heroin addict and he regularly stole everything he could from his mother. Did she learn and take action ? Nope. Instead she bought him a house down the block. When he was fired from every little job he ever had because of theft, the mother still did NOTHING.