In the NFL there is generally at least one hold on every play that goes uncalled. Far from offending our sense of fair play, we accept it as part of the game. Basketball is actually strategically centered around fouling and drawing fouls, charging players under the hoop and assuming their feet aren't set, which they usually aren't. These are perfectly accepted aspects of the sport. I hate the diving in soccer, but the push and pull of what the referee will allow you to get away with is a large part of every sport.