Trump is not fighting the establishment, he is fighting constitutional conservatism
QFT. And we all should be fighting back. The NeverTrump movement exists to save what's left of American conservatism, by explicitly rejecting Trump's rogue, racialist variety.
That's the silver lining here. Yes, Clinton will be the next President and that's a bad thing. But a landslide rout of the Donald will repudiate the alt-right and give constitutional conservatives a way back to respectability and influence.
If he's going to lose anyway, let's make sure he loses big.