Kid shoots up school, kills 17 kids.

Consensus is "His parents were bad".

Possible Scenario:
His parents were good, but he viewed proper discipline as "abuse".

Then at school, possibly, he thought he could take advantage of other kids.

>Kid with an attitude of "You can't tell me what to do!"
>Same kid thinks they're God
>Parents either sucked to make this happen, or were good parents, and he STILL ended up as an asshole kid

Damned if you do and damned if you don't.

What's/who's to blame? Anything. Anyone.

Kids can be hair trigger little pussies who think they can do whatever the fuck they want.