insanity is not a disease, it is when you give up. or have lived among people who broke you until you snapped. yes some people are mentally challenged but most people who murder others do it for desire, lust, anger, fear. theses types of feelings get over whelming or even over looked by others.
school shootings are not events that only happen because of mentally challenged people, sometimes the students become the shooters because of how badly they were treated or because they couldn't help but be a little different to other people and nobody wanted to talk to them respectfully. Do not event blame technology either! people go insane because the ass-holes that live on this fucking planet think that they can just punch someone and there would be consequences for their actions!
my friend was born with insanity