Fischer never insulted Jewish people. He insulted the fakes who use Judaism to promote their agenda - which is far from the teachings of the Torch.
Pawn Sacrifice was made by those very same fake J's. Calling a person, whom they can't silence, mentally ill is a common tactic of character assassination. Erza Pound and Saddam Hussein being two famous examples ( Adam Lanza, being another example). Another way is to call them a rapist/paedophile (Assange).
Fischer became a govmnt pawn in their cold war battle. IMO, there is clear evidence that the soviets cheated and so did fischer - or more precisely, his govmnt handlers forced him too.
I think that is the real reason he got upset with the US establishment. He was a chess prodigy but the govmnt took away his enjoyment of the game.
Fischer never hurt anyone.
He was a freethinker with unapproved OPINIONS.