Some people (think they) can't create, and settle for the lower hanging fruit of destruction, to still feel some kind of agency and power, and distract themselves from jealousy and self-loathing. Kicking a dog, trolling forums or kickstarter... it's all the same? That's my theory anyway.
I was looking for a fitting quote by Erich Fromm (whom I kinda should give credit for "my theory", I'm pretty sure I pieced it together from stuff he said), couldn't find one - but it seems that his book "The Anatomy of Human Destructiveness" might be worth a read :)
This individual is not all individuals. Purely destructive trolling exists, even by intelligent and outwardly successful adults, a hundred times fold in Minecraft - and in some cases not even seeking attention applies because of anonymity. Which is no problem for sadism: seeing the reaction is enough.
Creating can mean a lot of things.. it basically means doing something constructive, hey, even daydreaming or just curiosity. For me there is either progress (doesn't have to be anything big, it doesn't even have to be your own, as long as you have the ability to be happy for others), relaxation (ditto) or frustration and the compensation for it... but any talk of "creators" is entirely yours. You don't seriously think I was trying to claim I was never a dick in my life? Hah, I wish.