I wasn't talking about games being the desensitising factor. I'm an avid player of games myself, many of them very violent. More about a climate where mass kill

I wasn't talking about games being the desensitising factor. I'm an avid player of games myself, many of them very violent. More about a climate where mass killing is more visible and has less repercussions or damnation - e.g. war. US has been in more wars as the aggressor than any other country I'd guess, over the past couple of generations. Perhaps that mass death and resulting inpunity for people at the top contributes to these teenagers' lack of appreciation of the horror in their actions? I agree 'conventionally disturbed' is a silly term. Hard to find one better; maybe, 'absent of any identifiable mental disorder that would likely explain their murderous actions'?