This is TOTALLY DIFFERENT than the situation you posed before. It's like you're trying to get someone to agree with you. So yes, I'll agree with one thing...
Obviously, at daycare, they change diapers. Does your child go to daycare once a week for an hour? No. The expectations are different.
My youngest is in the church nursery for about two hours each Sunday, and I don't fly off the handle if her diaper is a little heavy when she comes out. I take her home and change it. Really, life is about so much more than getting yourself so wrapped up over a wet diaper. At least he's making an effort to see his child, which is more than some men do. Heck, my husband lives at home, faithfully, with our two daughters...the youngest is in diapers, and if I leave the house for two hours he doesn't change her diaper either unless she's had a blowout. I don't think it's cause for an uproar.