Pinker didn’t do anything for Epstein in 2007. That’s a pretty horrible mischaracterization.
> *"Epstein found aid from star psychologist Steven Pinker in the form of a 2007 legal document"
https://www.insidehighered.com/news/2019/07/17/steven-pinker...
https://www.insidehighered.com/news/2019/07/17/steven-pinker...
(disclaimer: I know nothing about this and have no personal opinion on the matter)
And even so, any one of us can hire an expert witness to make a statement like that. Especially big-shot professors. They aren't cheap I bet, but they surely don't cost 6 million bucks per line.
Though Pinker himself has said he regrets having provided that aid, so I don't think he himself fully agrees with you if you want to argue against it being something he should not have done.