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Actually, yes.
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He's acting on a delusion
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That's fueling this murder spree.
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For example,
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A man named Herbert Mullin.
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He had a fear of a catastrophic earthquake hitting California.
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Now, he believed that by killing people
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And offering their blood as a sacrifice to the earth,
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He could prevent an earthquake.
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He was a paranoid schizophrenic,
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And his delusion led him to kill 13 people.
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Uh, what should we look for when we're on the streets?