Boxing should be banned not only from the Olympics but from the World. A "sport" in which your objective is to inflict injury on your opponent is not a sport at all. It has no place in a civilised society.
Equestrian. It is the only sport where the human(s) cannot win without the help of another species plus the subjective scoring system. I would be fine with Horse Racing though.
Boxing- Simply too agressive.
Surfing- Weird why there is no darts or cricket but this sport.
Wrestling.- Another agressive one. It is just people just doing more agressive stuff.
None of these are going to be removed.