How fabulously successful the propaganda has been if the idea is "better to burn Catholics in effigy than Protestants in reality"! Read up a little about the pogroms driving Catholics from their homes in Northern Ireland, about the kidnaps and murders or random Catholics by Loyalist gangs (one boasted "the bullets going into her breasts sounded like they were going into a pillow").
Iconographising interracial or interreligious hatred is not a good idea in any case whatsoever; the truth will set you free.