Christian history is terribly mottled with mistreatment of the Jews. But of course at one time or other every nonconforming group received some rough treatment from the Roman Catholic church.
The fact that the Holocaust could have been promulgated by those claiming to be Christians still sends shivers up my spine. It's not unlike abortion today, where major Christian denominations not only turn there backs, but even advocate for it. The Roman church is no exception, where the honchos give scant lip service to combating this evil, but allow the the Pelosis, and Tim Kaines and Kennedys to worship and commune freely without fear of rebuke.
That will not sit well with RC devotees who present Luther as an incarnation of the devil, while admitting no mistreatment by their popes.