I had a point of being ok with it, because he was completely trained to put the other in the potty. So while we had one accident a day to deal with, it was only one accident. But he is now regressing and becoming lazy and will do everything in the pull-up because he can.
I've tried everything... and seriously I mean everything (short of laxatives!) But I can't convince him and he doesn't seem at all hurt or convinced by my disappointment, pleading, bribes, punishments, encouragement, etc. etc.
He's four now and yes I must admit I feel a little bit like a failure as a potty trainer... but really how in the world can you make someone else poop?
So I will continue to try and try again and grit my teeth and change another poopy diaper - but man, I'm pooped.