I guess deferment is in fairness to trainers etc who have nominated and accepted horses for a race and booked jockeys. Also for punters who may have placed non refundable early bets based on a particular jockey booked.
Deliberate over whipping however should result in the loss of the race the same as careless or dangerous riding. It is our industry that is a stake and we don't need to give those against it any more ammunition.