If the choice is between genocide and genocide + fascism, and there is no viable option 3 without genocide, then the argument is still embrace the genocide or democracy ends. The alternative is embrace genocide and who really needs all this democracy anyway?
That is literally every country on earth. The human condition is slavery, genocide, and exploitation, which is why we are the only species left in the genus Homo. This is not a uniquely American thing.
We are far more like ants in our eusociality, and all we can do is hopefully recognize that tribalism for what it is and try to do/be better as we move forward.