I have heard it said this way... a master troll can piss you off and make you not know why you're pissed off. As in - you don't even know why you're angry. Meaning the people who have Chris paranoid to this day are good trolls. That he's always worrying about and angry about despite the fact that, well, most people have just stopped trolling him altogether.
A bad troll is just a dick. -Shrugs.-
Just my observations on the ethics of it. What Blue Spike did? Bad troll - a complete dick. Clyde and the PandaHalo - pretty genius because it was just online interaction and, well, causing people physical pain isn't funny - in the previous example. Chris shows a true lack of empathy for his fellow man in numerous ways (unable to relate). A trip and fall is funny, yes. I may be new to seeing Chris, but I've been through practically every page of the wiki, read through the forums, and watched a large chunk of the videos, but it wasn't until I saw the documentary that I thought about it.
Just saying, in my opinion - his trip and falls (tomgirl, destroying his Playstation, and thinking himself more clever than he was) are much more funny than the thought of him going to jail or ruining his own life in such a manner (losing his tugboat, unable to get a large number of jobs because of the charges, and so forth).
My opinion comes from back in my trolling days when I was younger - chatango, yahoo chats, and so forth. There's a difference in humiliating someone and letting them humiliate themselves, rather than causing them physical harm or causing them to harm themselves or do illegal things.