Sexual abuse is OK?

I had a patient in residency who had a brain injury and we couldn't discharge him to his parents' house because he sexually abused his sister when she was nine (she's 14 now, and the patient had been living with his grandparents so he wasn't near her). I was mentioning this to the new attending and he was like, "So what? He sexually abused her a long time ago. He should still be able to live there."

Uh, okay... "I was told that if he goes back home, we have to report it to child protective services."

"That's not true," the attending insisted. "He hasn't expressed any intent to hurt her so we don't have to report it. The sexual abuse was a long time ago."

"Yeah, but he's already attacked two women here!"

"But his sister won't be involved in his care," the attending said. "They'll be living in the same house, but she can avoid him. And she can leave the house if she wants."

I didn't even know what to say to that. I mean, how would he like a serial killer living in his house, provided the murderer hasn't specifically stated he's going to kill him and he doesn't have to go near him? I was totally baffled by the fact that he thinks there's nothing wrong with making a 14 year old girl live in a house with a guy that abused her. And "she can leave the house if she wants"? WTF? She's FOURTEEN, not forty. Where was she supposed go?