For game stuff, it's a poor idea. Real world though, the mutilation or abuse of grave remains (human corpses) is a felony. Owning them is not a crime as long as you didn't steal them, don't intentionally damage them in some way, or try to sell them. There are a number of exceptions to this as long as the proper legal channels are taken. It also depends from state to state but generally speaking, if your criminal neighbor dies, it's still against the law to scalp him. Keep it a free practice in Salem, It's a good part of the PVP.
Here's chapter 10 of the Louisiana Cemetary board's regulations concerning human remains.
http://www.lcb.state.la.us/legal/chapter10.pdf
And just for the record, it isn't about the corpses "rights." Technically, the corpse is the property of the deceased's family, while veneration and respect for the dead are a big deal in most places around the world.
Just to be clear though, I'm not arguing in favor of Nsu's idea. It's a bad idea.