I think the reason is sort of philosophical. Know why there are so many statues, texts, and paintings of historical figures that have survived today? It goes back to the human drive to be noticed in the world. What all of these people have in common is simple: they are immortalized forever. Even they they are physically dead, their lives carry on. All of these people wanted to be noticed, to be regarded in life. Hell even Hitler and those kids who committed the Columbine massacre have been immortalized forever. It doesn't matter whether the attention is positive or negative. All of them wanted to be remembered as someone great or as someone terrible.
So why am I saying all of that? It's because people validate their existence through social interaction. We learn a lot about ourselves through other people. We can either be a hero or a monster, depending on how people treat us. But if people never said a word to us, never attempted to interact with us, never even noticed it if we touched them? That's basically the exact same thing as being dead. The world suddenly becomes a prison and our existence is threatened. No matter what, the vast majority of people (not counting those with certain mental defects that cause them to want nothing to do with people), even us on this site, need others to validate our existence. Even though negative attention is likely to cause us a lot of problems, it's still better to be regarded as a somebody at least rather than feeling like a solitary prisoner in a room full of people.
Don't know if any of that crap made sense, but that's how I see your problem. Although it's certainly not a good thing to be hated, it's still way less cruel than to be ignored. At least if you're hated, you know your worthy of it. To be ignored means to be worthy of nothing. It's even better when your name and identity is immortalized forever because you technically never die as a result. When Joe Schmoe, who lives in his basement, never leaves, never did anything for anybody, never tried to communicate with anybody, and has no immediate family or friends, dies, he will be erased from history, and that's truly sad.