What triggers the mind? What causes us to kill?

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Imagine killing a 6mth old baby, stabbing to death? what drives you to it? can you really be that desperate for money? do you need to go over the edge to do something so heinous? surely there must be some imbalance that causes you to do somethign like that. well thats the latest back at home. it's an old court case but the truth was finally told yesterday. makes me cringe.......