It's just a malfunction in the brain. There is no reason behind it. We have a compulsion to eat, we can look at it afterwards and say I need to eat so that I can get calories and vitamins and live. Why do people with Parkinson's disease shake? Why do people with Tourette's Syndrome jerk around and yell sometimes? Is there a reason behind these actions?
We can look back at our impulses for sex, food, breathing, fellowship and can see a benefit to them. But just because our brain tells us to do something doesn't mean there is necessarily a reason for it. It's a malfunction. Now their impulses exist for many reasons, I mentioned a tumor. Sometimes things are just wired differently. Nature makes mistakes all the time. When it comes to the brain, the tiniest little change can make a HUGE difference. There is a lot of interesting... and sometimes f'd up brain research that goes on. Scientists can open up your skull, touch a certain part of your brain with an electrode and you might "taste" apples, raise your arm, or even sense someone is next to you. The list goes on and on. Have you ever heard of Broca's Aphasia? It's a very interesting disorder when people literally forget how to talk. Broca's Area affects outgoing language (if I remember correctly) and Wernicke's Area affects incoming and written language. When someone has an injury that affects their Broca's area, they cannot use language at all, but if you talk to them they can understand you just fine. Usually they can write what they want to say, they just can't make sense of it to say it. Strange how that works isn't it?
Anyway, just something so small as a pin prick into your brain can make someone unable to use language, do math, etc.
I got off topic, lol. I don't think there is any real desire to be evil by those people. If you could rewire their brain to the way that most people's brains are wired, I bet they would be a perfect neighbor.
Now, when it comes to justice and prison, I have to go with John Mill more or less. I will paraphrase his beliefs to fit this situation. It is better for everyone else that the dangerous person be locked up, even though that person is not necessarily evil.
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