I don't get it either. Our shelter dogs were always crated overnight since they weren't allowed in the bedrooms and they would go there when it was bed time with no problem. Occasionally they'd go to their crate to take naps or seek refuge there during storms. I guess if a dog willingly going into a crate to sleep while everyone else slept is cruel and abusive I don't know what they'd think about actual abuse. Our dogs lived long happy lives. Most dogs I know have a spot that's tight and cozy, maybe even covered, that they go to; crate or not. If you crate train with positive reinforcement it's a benefit for everyone IMO even if you don't make them sleep in there.