Actors play unpleasant people sometimes. It's part of their job. He's played Macbeth too who was a brutal murderer.
The problem is...I don't think he played the guy as a creep. I don't mind when a creep is played like a creep, but when creeps are glorified...well, the actor doesn't have to take the role. It's a moral choice.
How awful to be forced into that role and forced to talk about how awful that the eeeevil conservative "moralists" made Kinsey's life so miserable.
So sad that actors have to lie about their feelings for a person so that they can work.