I see it another way.

By the time Auschwitz happened it was already way too late to oppse the Nazi Regime. It was too late to save lifes and prevent tragedy. But at Dachau it wasn't.

It also makes it seem like this (Donalds Dachau) is the endgame. Like this is the worst they will do. When they will in fact do much worse.

By calling it an Auschwitz, I feel we're kind of throwing a towel and telling ourselves that the MAGA-Regime is already too powerful. It isn't. They're only just starting, they can still be stopped. It also makes it seem like this is the height of their tyranny, which it isn't. Noone should stay at home thinking "well, it isn't that bad" but instead go to the streets thinking "it mustn't get worse"

Also we all know that Dachau isn't "harmless" in any way, and my comment should be pretty clear that it was awful. Comparing it to dachau isn't normalizing it, it isn't disrespectful, because it's what gets closest to it. On the other hands it can be seen as disrespectful to all those who suffered and even perished in Birkenau to be compared to "Donalds Dachau".

Lastly let me assure you that I am NOT, as implied in your comment, defending the current US-Regime nor normalizing Dachau.