Lot of trolls aren't just angry, they're hurting badly (sometimes quite literally). It's something I try to bear in mind. I know what it's like to rage at the state of the world and what one perceived (honestly, often accurately) as people's stupidity and evil.
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I still don't find that way of expressing it acceptable, but the level of control I used to exercise over my anger doesn't seem to be very achievable for most people.
(Or indeed for me, now that I just sort of let it be - although I'm feeling less and less need to express it.)