Like most pedophiles he genuinely doesn't see anything wrong or inappropriate about having a sexual relationship with a young girl. In fact he sees it as a "pure" form of love and can't understand why people would disapprove. The fact she's also his step daughter is irrelevant to him, as is any moral or legal aspect to the whole mess.
If this, and his interaction with the other young girls in the family had been properly investigated - or Mia fucking Farrow had reported it when she should have - he'd have been Bubba's Bitch in jail by now. But no, he's a famous movie director so he gets a pass.
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