They are not "unable." They are not inclined to stop him. They covet everything he is doing, or at least allow him to while they scurry around pulling their fuckery in the shadows.
I think January 6th was the inflection point for that. Democrats have been shifting right and becoming feckless for a while, and Republicans have become less principled and more power-hungry at least since Obama. But when Republicans failed to disavow the insurrectionists, it was over.
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Gone.
Done.
Destroyed.
If something emerges out of the ashes, but lets not get ahead of ourselves...