I agree with your description of fascism, but add authoritarianism. The tribalism you outline gets a needed discipline from the organizational powers of authoritarianism, to turn it into nationalism.

I think authoritarianism accounts for more than fascism's ability to make the trains run on time. It's what enforces the intellectual uniformity that binds fascists into a coherent force, at the same time that it renders the intellect shallow--the fascist can, on command, turn on a dime intellectually, and believe that we've always been at war with Oceania. But every fascist believes today's orthodoxy to the very core of their beings.

Yeah, screw Godwin's Law. To be fair to Godwin the human being, I read just this morning that human Godwin says, yeah they're Nazis, get 'em boys! Not his fault that the right weaponized his observation.

But we're done with Godwin's Law. A swastika proudly displayed alongside a Confederate battle flag killed it dead.