The thing to keep in mind is this guy had huge psychiatric problems. He was profoundly depressed and self-stimulation did not appear to help.
有一点值得记住的是，这个人有巨大的精神压力，深刻的抑郁症，而这种自我刺激看上去起不了什么作用。
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The general story of why we can't in general is because there's no surprise, there's no mock aggression, and also there may be a general deadening of self-stimulation.