Look, so far, no one has died at the so-called Alligator Alcatraz. That's why I agree with you that it's a tacky comparison and an insult to survivors of the Holocaust and their families.
If people start getting murdered en masse, then we will have to have revise our description.
I'm not saying Trump's administration is not capable of such atrocities (although personally I actually don't think he really is aiming for that, and despite being crazy, I genuinely don't think he's aiming for something similar). I'm saying we're not there yet. I really don't think Trump is aiming for that. He may be a lunatic. But he's not a genocidal maniac.