Where does he say that? I don't see that. Edit: I'll save you the trouble: You can't, because it doesn't exist in the letter linked.
> I was never involved in, never heard him talk about, and never saw any evidence of the horrific acts that he was accused of.
But fine let's say you're right. "I knew he'd done this, but at his house I never saw evidence of rape or trafficking" isn't much better. He should resign.