When my good friend and roommate at the time told me (about 35 years ago) that he had hit his girlfriend, I was sick to my stomach. He was (is) someone you'd never, ever think would do something like that. Kind, smart, hard-worker, loyal and thoughtful friend, gentle guy. He was about 22 at the time. I came to find out that his dad (also a seemingly good and generous man) had a temper and had hit his mother on occasion. My friend got so frustrated with his girlfriend that he resorted to what he'd had modeled for him. NO EXCUSE -- just a reason, a way to understand how/why something like this happens.
My friend's been married (different woman) for nearly 30 years and I don't believe (though who knows?) that he's ever done that again. He was shocked with himself, but it happened and he had to accept that he did it and move on from that.
I realize the accusation is different, but I tell the above to suggest that AB's persona may hide a different side of himself (to some extent we all have exhibited behavior that we wouldn't display in public). I don't know that he committed a sexual assault, but if he did I hope he's horrified by it and never does it again. If the accusations are true, I hope the victim can get past it in a healthy way.