The establishment has already put forward the narrative that the "Holocaust" was only possible with the use of homicidal gas chambers. Without the homicidal gas chamber, there can be no extermination camp, and there can be no Holocaust. Wartime concentration camps are never a fun place to be. But it's this notion of "industrialized mass murder" that earns the "Holocaust" its unique place in history.

Well I'm not the establishment, nor do I subscribe to them. And no, don't downplay Germany's concentration camps. These people had no reason to be there in the first place, and they were deliberately put in harms way to stroke Hitler's ego (i.e look at how the V2 Rockets were built. They often relied on dangerous slave labor that killed those who worked on it). If you want to build war material, do it with your own population and with a proper salary. But don't round up civilians at gun point and order them to make weapons for you.

The American government murdered dozens of cult members much more recently, does that mean that American liberalism is irredeemable?

Yes? I don't support any government that murders its citizens who haven't committed any real crimes. But the U.S government still allows for freedom of religion so it's not quite an ongoing purge. In one of my links, it was clearly mentioned Germany tried to ban the Jehovah's Witnesses and they brutally beat up those who kept their faith.