I've been on the web since 1994. The web had 3004 websites on it. I've lost count of the number of cities and countries I've lived in since then. I've always been online 24/7 (well, I had to sleep).
In all that time, I have never encountered a single troll who was anything but nasty And it has nothing to do with saying what nobody else will say. I say what other people won't say, and I've been doing it my entire life. So do other people. No need to troll others. In addition, Anonymous does it as well. They don't troll.
There is research where a university asked a fairly large sample of people to do psychology tests. They then asked those people if they trolled. The people who said yes also displayed the Dark Triad characteristics.