Since I stay away from the part of the HP forums that have religious/political discussions in them, I don't run into a whole lot of the kind of people who just aim to get arguments going for whatever reason they do. If I saw something in the "other" part of the forums that looked lit it was there to just make trouble (or be spam) I'd just ignore it.
The "Answers" section is another thing. Who asks questions for what reasons looks like a giant mix to me. Although the original "thing" with this section was supposed to be to give people ideas for writing Hubs, these days it looks like people are just using "Answers" for discussions. There are all kinds of question-askers who look "questionable" but don't APPEAR to be up to anything aimed at making trouble. Who knows who's up to what "iffy-ness", but much of the time people who look like trolls have reasons other than trying to start trouble.
My thing is that if I'm bored and can't think up something to write I'll come looking for questions that I feel like trying to answer. I used to get the occasional Hub out of it. These days I don't (because one reason I enjoy just writing answers is that I don't feel like writing a whole, structured, Hub
As far as I'm concerned it can be hard to tell the difference between a "real"/"conventional" troll and users who slap up an obviously fake profile and "whatever" image but who may have "legitimate enough" Hubs that they want to attract attention for; so if I write an answer it's because I feel like it (I have its date and copies), and it serves my purposes.
I stay away from users who have a profile image that looks "super-iffy" (cheesy/objectionable) and sometimes an image posted with a question will be enough for me not to answer the question.
Other than, and cynical as it may sound (but let's be real here), I have little doubt that a good part of the time I'm "engaging" or "feeding" either a troll, a borderline troll, or someone/something who/that gives off some real troll vibes, whether or not they are.
In spite of all that there's some fairly good discussions that show up on here so that's fine too. There are times when I'll write an answer and get something back that makes it clear there's real troll-like behavior, at which time I don't bother with more than my original reply.
I may at times be bored and/or tired, but I have no patience for things that start to look too ridiculous. I do have other things to do/write.