Xenocide Norway used to harass and threaten people, but they used longships and cool axes. That doesn't make it okay but it does mean that after enough time has passed they'll name a football team after you.
Raggamuffin The video confirms: because they are assholes.
BiggerJ Haven't watched it yet but I'm reminded of the most recent season of South Park. Kyle's dad becomes a troll and joins a trolling community, but it turns out he's the worst of them all because all the others are misfits who have banded together to have somewhere to belong and to lash out against the society that rejected them, and Kyle's dad just trolls people to wield power and make himself feel good.