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The Season Ten episode "Tsst" actually deals with this, showing how he became the way he was. Basically, his mother didn't punish him for his actions, or even attmept to teach him right from wrong. She gave him whatever he wanted and let him do what he wanted, all because she had no real friends of her own, and so spoiled her son into being her friend, rather than being an authority figure over him like she should have done.

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