You have to tell them they are bad ideas but:
-- they are bad people who deserve to have bad things happen to them because of something someone who might have looked like their ancestor did.
-- or instituting them will screw up people they don't like so if it screws them up too it is no big deal.
Or just tell them it's a Democrats idea!
Seriously, I used to use that ploy on my liberal "friends". I'd say Clinton proposed X when the GOP did and they loved it! Or vice versa, tell them the GOP proposed Z when Clinton did and they hated it!