Hitler did not round up 6 million people at one time. He did so over the course of the war. I doubt there were 11 million Japanese citizens in detention camps. 11 million people is more people than many state populations. When deported, there will be a huge refugee camp just over the border? Nah.
For someone who "clearly recognize[s] that Trump is a danger to every living thing on the planet," you're pretty fucking flippant about the very real danger of this plan that all of Trumpworld is very enthusiastic about (trying to) implement.
And it's the trying that's going to cause a lot of harm.
I guess I don't understand the point of not talking Trump's stated campaign promise at face value. It's a very specific promise (not like "I will bring back prosperity"), very much supported by the other people in his party, and a promise his supporters will expect him to fulfill.
Why would you assume that this promise can only be fulfilled by rounding up all 11 million at one time? Of course it would be a process over time, horrific no matter how "successful" they manage to execute the plan.