This is something that i think needs more attention. I don't know how to coin this or interpret this or whatever, but it seems like there's a large amount of men, especially young ones, that upon the realization that they aren't particularly special or won't get what they want in life, decide they need to affect other people in some way. Maybe they're ill-equipped to find a way to do that in a positive way, or maybe humanity's just exceptionally good at finding ways to kill each other, but they seem to think that grabbing a gun and making some noise is the right way to move forward with their existence, until they end it of course.
How can this be defined? Is it desperation for attention? Desperation implies the intent on receiving a reward of some kind (even negative attention) so it's hard to call it this since most of these individuals promptly kill themselves. Is it to be remembered? Maybe, though I've never personally met someone that had such a hard-on to get remembered in the future that they'd murder a bunch of people to do it. Plus what teenager/20-something really cares about their 'legacy'? That usually comes from old shits with too much money.
So I guess, what motive would a kid have to do this? Or am I reaching for a motive where one doesn't have to exist, because crazy?