I agree with everything you've said here, but I have a few quibbles:

"Washington’s unconditional support for Israel"

"Support" might give the impression that Israel has the leading role here. You yourself have derided those who believe the poor little US Empire has been led astray by big bad Israel as pissweak excuse makers. Israel is doing exactly what the Neocon faction wants it to do - start a World War.

"a war with China would be completely unwinnable"

I don't think the Neocons are unaware of this. You yourself have said it: they're playing chicken with Armageddon. They know they can't win a World War (if for no other reason than that their enemies are also the suppliers of key components of their weapons systems), they're just trying to convince the Rest of the World that they're willing to go there. We understand this abusive relationship when we see it at the human level - those arseholes who always escalate conflict beyond all proportion to what's at stake, to make us back down, our submission treated as consent. It may seem bizarre to see this behaviour on a global scale, but it's essentially the basis of every hierarchy.

"the US empire is not run by rational actors"

The faction currently in the driver's seat of the Empire are definitely insane, in that they're psychopathic and murderous, but I believe it's a mistake to think that they're irrational or stupid. They have a plan that could work, if the Rest of the World fails to call their bluff. It's up to us to convince them that their Empire is indeed over, that it's time to go, if not gracefully, then at least without blowing the planet up on the way out.

A less insane faction could take the reins of the crumbling, sprawling US power structure, one that is willing to accept multipolarity. The current stirring rebellion of the Global South would be a convincing impetus here - they have less of a vested interest in the status quo, and have already endured centuries of hardship.

"Democrats are Pigs"

Pigs may wallow in their own faeces, and they may not be above cannibalism if you throw a bit of pork into their feeding trough, but I feel that it's quite unfair to compare them to US politicians.