pete rose was betting on baseball, which actually has something to do with playing baseball. if the debate was about whether michael vick should be allowed to return to a job breeding dogs, then bringing up pete rose might be relevant. and i'm not sure what you mean about oj simpson. he was retired when he allegedly committed his crime. and he's still in the hall of fame, so, if you want to point out how he hasn't been in any movies since the trial, then i still don't agree with your position that that equals justice, but at least the example makes more sense.

edit- oops, charin beat me to it. oj still in the hall of fame