I mean, he's real angry, has a superiority complex, is racist, is psychologically unhinged, is socially isolated, has above average intelligence, is meticulous, is almost certainly virginal, and is full of largely directionless rage.
In short, he's the archetype of the angry young loner who commits an act of terrorism. Why hasn't he?
(Edited 6 minutes later.)
Because that isn't an actual archetype for that. And because Kimmo is too lazy and likes his easy life at home with mommy.
That would require him leaving his basement.
His mother keeps him locked up in her basement.
He has on the Internet and 4chan. Kimmo lives in cyberspace