I can't speak so well, for the legal side of things, but this whole "I don't like them, so I'll send takedown notices" attitude bugs me, too. I'm actually fairly surprised that the Wikipedia community, which day-in and day-out is greatly concerned with getting these *same sorts of complaints* from people who want to control our content through legal threats and similar means, would quickly turn around and threaten or plan the same sort of behavior against other websites.
At this point, I would strongly oppose attaching Wikipedia's name to any action of this nature, except in the most dire circumstances. If this is done, let it be done by individuals who represent themselves and their own interests.
I don't like trolls. That's why I block them on the wiki. Past that, I'm less concerned about whether it's the business of the Wikipedia community -- communal antagonism of this nature only encourages them, you know.
Just a few thoughts, -Luna