In schools stuff like nationality or race or if the shooter was originally from that school or had a reason to hate the school and wanted to get revenge and make themselves feel better. People can also be on drugs and not know what they're doing.
I’m sorry to say this but- who’s actually going to write a whole essay? There’s a difference between asking one single question than asking someone to write a whole essay for you. However, I hope you find someone who is willing to do this for you.