My 5.5 year old is the same way. But I don't know if he would give in and wipe himself if I refused to do it. I think he would sit on the potty and cry. I can't do that to him, so I still wipe his butt. We're already using wet wipes, but I've considered making him some soft velour wipes that are nice and big so there's less chance of him getting anything nasty on his hands.
My 3 year old, however, loves to try to do it on his own.....even when it takes 1/4 of the roll of tp to get clean. *sigh*