Leftwingers on social media are posting hundreds if not thousands of posts a day insisting that the US is running concentration camps.
They always invoke Hitler ... never Stalin, never the Gulag.
They always say, "It's just like Nazi Germany. It's just like a concentration camp."
Why don't they ever say, "It's just like the plantation. It's just like slavery"?
Because they hate Jews and they are Holocaust deniers.
Because they curry favor with African Americans. Because they would never step on African Americans' toes in that way. Because they assess African Americans as being on board with their larger anti-Western project in a way that Jews are not.
And because they know that African Americans would come down on them like a box of rocks if they dared to appropriate African American symbols and history as they do Jewish symbols and history.
They know, given the background level of antisemitism, that they can get away with bullying Jews in a way that they could never get away with bullying blacks.
And now you know why the "concentration camp" metaphor, but never, ever, the "black slavery in the American south" metaphor.