Seems odd to bring up necrophilia, but in general, except for hygenic and crime investigation reasons, "abuse of a corpse" seems like a strange kind of law as well.

I certainly couldn't care less what people might do with my body once I'm dead. Burn it, bury it, ignore it, worship it -- whatever floats their boat.

This is totally ridiculous. I guess we forgot that society governs itself based on moral norms. Approximately 0% would agree with necrophilia while I am thinking at least >50% would be okay with the idea of donating organs. When you add in the fact that you can opt out... how can anyone object? If you care enough, go ahead and opt out, no one will know or care. You are making a stupid and ridiculous equivalence.