Sure, declaring yourself chosen is a good way to make everyone else the outgroup, with all the dangers that entails.

I don't see what this has to do with my response, though. Racial genocide against the self-styled chosen people is still racial genocide. Saying it isn't is just incorrect. (I think Whoopi's suspension is ridiculous, though. People don't know everything! Just let them learn; don't take them off the air every time they say something wrongish.)

The holocaust is a good lesson for high school because it is an incredibly clear and well-documented account of the absolute horrors we humans can inflict on other groups. You can come much closer to getting inside people's heads than with any other example.

Neglecting the horrors of slavery, or the conquest of the American Indians, or the savage destruction of the Incas by Pizarro, on the conquest of the Aztecs by Cortez, would be poor education. (Ideally, you'd want to teach the cultural practices of the Aztecs and the wartime practices of the Comanche to complete the depressing picture of human nature.) If the history of the holocaust is taught at great length leaving no time for any of these other things, then they'd need to have a very good justification for why that's an appropriate use of time. None occurs to me.

Much of the U.S. does not forbid using 1619 project materials for teaching; I'm sorry you live somewhere that does (apparently) and would like your children exposed to it.

On the other hand, you say yourself that "centering one's own group should be expected to cause resentment in the others" and that's exactly what the 1619 project does if used as history...so...it is unfortunate but perhaps not unexpected?