His russian imperialism support and his broad rejection of the eastern european civilian uprising against the communist project. Like many idealists he took a utopian, idealizing view and ran with it reality and real suffering caused be damned. Like many idealists he offered basically a API for sociopaths to be hijacked and used as a useful idiot against humanity. This way predictable leads to ruin and ashes as legacy and it did so for him. The epstein connection is just the cherry on top.
Sounds like bit of an over-reaction if I am being honest.
Some of his books are deeply insightful even if you decide to draw the opposite conclusion. I wouldn’t say anything would create disgust unless you had a conclusion you wanted supported before reading the book.
Regarding the Epstein thing, bizarre to bring that up when discussing his works, seems like you hate him on a personal level.