Trolls are a different species. Biologists inform us that trolls are characterized by the use of flame baits. A dictionary further enlightens us, explaining that a bait is "food or other lure placed on a hook or in a trap and used in the taking of fish, birds, or other animals".
Now, the key insight is that for a troll to survive, it has to use cost-effective baits. That is, the bait should be significantly cheaper than the food, or else the troll will go bankrupt.
Of course, your not-so-well-thought-out emotional response counts as a medium-sized piece of a fish, a bird, or some other animal. But let me assure you, this post is way costlier and thus makes a lousy bait. Try doing something like this, and you'll realize that a troll will not pick this path to ensure its survival.
I don't understand. I think there's something to be said about their brains being different from more sociable/enjoyable people.
They're sociopaths; mentally retarded to some extent. Not only do they do things that damage other people, they also do things that damage themselves. The way they behave is more severe than being strange or annoying, their behavior pushes anyone away in favor of the high they get from attention of all kinds. As human beings, they make their own lives more difficult because of a crippling addiction.