No, of course it doesn't excuse his behavior. To be blunt here, Bobby Fischer was a vile human being. Chess, as great a game as it is, is not that important in the overall scheme of things. Bobby Fischer was an amazing Chess player but so what? He (Fischer) did not ave lives, did not come up with a cure for cancer, did not solve the middle east peace crisis. All he did was play Chess. That is ok, but when one is as arrogant as he was they deserve no accolades or any respect. I also think that despite his arrogance (on the surface) deep down inside he was a bit of a coward. How else does one explain the endless mind games he liked to play with opponents. If your better at chess, then simply prove it at the chess board instead of resorting to childish tactics. Again, he wouldn't admit it, but I believe he didn't defend his title in 1975 because he was afraid of losing and his ego could not handle a loss. So instead he came up with a list of conditions that no one could possibly agree to (and he knew it) and when FIDE didn't agree with all his terms, well, that gave him the excuse he was looking for.
Great chess player... awful human being.
Bobby Ficsher was the best chess master ever to live but does that make the fact that he was at times a very crude and hurtfull person ok.
please feel free to post your opinion on this.