1. "Perhaps .... marginal".... "one simple classroom lesson." Minimizing seems to be your go-to rhetorical thing. Just don't think it actually changes anything.
2. You posited a difference between A and B, misidentifying A. That's a dead end. Why did you feel obliged to misstate what would be taught if H and M were right?
3. I don't believe you made any assumption about my ability to back up the claim. You just like the rhetorical position my not doing so creates for you. Like you say, never mind.
Germany is not a counter-example. American kids learn that White people screwed over Black people. The slave trade is taught, and slavery is taught. The "lies" are almost all omissions - mostly what was done to the people who got here first. Do German kids learn about how the Franks dealt with the tribes they conquered back in the creation of the nation? Harp on WWII all you want. I don't think it's even minimally relevant.
I did not say we shouldn't teach kids about what White people did to Black people. On the contrary, I noted that the depredations are being taught. They were taught to me, and I'm sure they were taught to you. (Much less so about the pre-Columbian settlers.) CRT is about ongoing injustices built in to society. Rejecting the teaching of CRT in K-12 does not mean rejecting its conclusions or not teaching the events it cites.