You can't really say voting is the solution if part of a troll's purpose is to subvert the voting process.
Who cares what the person's motivations are?!
Why do you care so much about the pattern of electrical activity in his/her brain?
If his/her posts/comments are voted up a lot, then they are good ones in an objective sense.
A person with a strong but controversial opinion will stick to and defend their point of view throughout the debate. The end result might be that I now understand a new point of view, or that they alter their point of view.
A troll will duck and weave, change topics and backtrack. The goal isn't to express an opinion they believe in, but to annoy people and get responses. The end result is that I waste my time reading their posts, since they're not going anywhere with it.
Sometimes you can only tell the difference after the dust settles. I'm still trying to make up my mind about this thread ;)
i don't quite see how someone could be a "good troll"; if they are being voted up then at least some users feel that they are contributing to the discussion.
You can't really say voting is the solution if part of a troll's purpose is to subvert the voting process.