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I think there are several reasons. One is it is partially the same reason we love horror movies and monsters only this is not frankenstein or dracula. I think, for most people, they are far enough detached from the subject that it is "interesting" they want to know what made the guy do this or why they started or what was wrong with them. Part of it is, as roger waters put it, the bravery of being out of range. I like scary movies and part of what makes them fun is that they are not real and after 90 minutes life is back to normal. For many the same goes for serial killers. The killer lived 1000's of miles from them and has nothing to do with thier life so it is hard actually grasp the reality of the situation so it is still interesting. The killer is so far detached from your every day life that it is almost like it is not real.
But I think the main reason is that, in the end, we are human and we are all facinated by the human condition. We are fascinated by serial killers for the same reason we watch reality TV, Sports, and read the paper. Human life is drama and the more intense the drama, the more interesting it is for many of us.
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