RE: Compulsory Registration ?
I would not necessarily say I lack experience with forums, but you are entitled to your opinions. The thing is this (IMHO) - in a forum, you should really try to behave the same way you do IRL (we seem to have some good examples of the opposite in this thread). Note that registration does not imply identification (although I usually prefer real life identification myself).
You should not fear trolls, you can make them go away very easily, by simply ignoring them (works every time, since trolls feed on attention).
You should not fear administrators aggressive editing (which has nothing to do registration, BTW) - If you feel it hurts the forum, or you, you simply quit the forum.
Regarding becoming a target, I'll send you a private message (another benefit of registration), giving you a nice way to avoid it.