I find this upsetting because of "this decision is final, this is settled".
He is presenting himself as way more significant than he is, either because of complete lack of self-awareness, or preemptive defensiveness against inevitable criticism he can't handle, or overcompensating for inability to cope they are on the losing side.
Neither has any semblance of EQ, emotional maturity or humility. These aren't the kinds of people who would rule in a fair, meritocratic system.
We can all agree it's immoral, but it's also just plain stupidity.
Even if you are white supremacist "kill all people of color", you still need a professional military that's not wasting time massacring civilians and creating PR disasters daily, if you hope to win any wars at all.
Also "their place in history is settled": sorry to ruin your day but that's not how collective processing of historical trauma works, nor history as a science.