He was at Epstein's House of Horrors for the same reason as the rest of those men. All those people who ran in the same circles knew what Epstein was doing. It's what they do. They cover for each other and use their power to abuse people, particularly kids.
Here are Dershowitz's denials. Are you really buying these?
"What happened was I, um, he lent us, this was well before any of this thing came out, he lent us his house once. And I was there, my grandchildren were there, my daughter was there, and we all got massages."
"And, um, it was therapeutic. I had a therapeutic massage with an old old Russian, but I never never ... and that was part of when we had his house for about a week during I think it was Christmas vacation."
"Believe me, if I had known that anything improper had ever taken place in that house, I never would have allowed my children, my grandchildren, my wife, my daughter-in-law, my son, to have spent time there. I can tell you categorically there were no inappropriate pictures, no inappropriate anythings. It was like any other house."