It isn't like albino or pie-bald is a sub-species of deer or a rare separate species of deer that we should protect. If I understand it, it is just a genetic disorder. So I don't see any problem with shooting them. Since it is genetic, if you shoot one, then it will likely lessen the chance of that genetic abnomality ending up in your deer herd's gene pool. If you think it is cool or like the look, let it live and proliferate its genes.