Just look at the rather, uh, colourful language you are allowed to use. Just look at pretty much any of us - except, say, Saint Daystar Clarion - who post here with little to no restraints - we use nasty words, foul language, some of us seem to have verbal diarrhea; we posit sometimes extreme and extremely unpopular viewpoints, and we don't get spanked for it, because it's but human to err in the melonfarming vocabulary department when emotions go high and we don't feel like it's a Borg suit'n'tie event.
Some of the bans seem harsh, when people get banned for one-liners or similar n00bish infractions. Then again, I must say that I myself am pretty sick of one-liners. Just look at pretty much any video or video sharing site, and you'll see an approximate 0.0001% of one-liners actually being funny, the rest being of the illiterate, propagandist or plain stupid kind. Granted, those still seem to be rare here, but replying to a thread with one line or just one word is not proper style, and I welcome it being discouraged.
As for perma-bans... I tried to keep a tab on those, and all I can say is this: Just from superficial analysis I can say that I have not seen any 'unfair' perma-bans. People were asking for it, and most of them have been hard working on making it happen. Some, amongst them some very active and outspoken non-meat-eating forum members, seemed pretty instant but having had a look at some of the material they posted actually saw me worried about their in-the-flesh, IRL proximity to humans, animals, plants and inanimate objects.
The moment you manage to get perma-banned, why would anyone want to hold on to their avatar, and why should they be allowed to prolong their negativist, obnoxious and toxic presence?
I've been privvy to some personal interaction with some of those that are no longer with us and, yes, I can confirm that none of them were proper evil, but it's most likely a stupid person that will run you over, rob you blind, shoot you dead, eat your dog or rape your horse. Proper evil is rather rare, and the Escapist forums are no exception to that rather simple fact of life.