..people have been murdering since the beginning of man
..males commit over 85% of murders
...human males become very defensive/aggressive in the slightest---most ''irrelevant'' situations
obviously it's testosterone/aggressiveness/territorial/psychological/etc
...perfect examples are when cops pull people over for a minor traffic offense--you usually get pissed off--even though you were committing the offense--yes?
..when 2 males get angry--it can lead to trouble
a lot of these stories have more to them than just the immediate problems before the shootings
if you have just .1% of the US population as wacko/crazy/''murderous''--that still equals 300,000 wackos [ if my math is correct ]
briefly--this is what some humans do
add in poor parenting/socioeconomic problems/social problems/etc and you can easily see these things happening