Nah, people will get over it quite quickly. Before it happens people imagine that others will be all upset and do something, after it happens realpolitik kicks in and the world quickly adjusts to the new balance of power. Much of the world has a vested interest in the US staying the dominant hegemon and militarisation of space won't change that.

Are you joking?

No I’m not. I actually consider it a preferable outcome to the alternative which is a great powers conflict (WWIII) that would generate untold, potentially nuclear, destruction. If I found out the US did this I would breathe a sigh of relief and I’m sure I’m not the only one. So long as China thinks they have a realistic chance of dethroning the US they’ll take that chance. If the US fails to secure a Russian defeat in Ukraine that’ll only embolden China further. Ideally I’d prefer for the US to fix its own problems and retake its seat as the undisputed economic and moral arbiter of the world but I don’t think that is likely. My biggest worry is that the US believes its own missile shield hype and picks a nuclear fight that the US then loses (hint; everyone loses).

Why would any other country care about the US 'being dethroned' after '250 tons worth of mini nukes' have been launched into orbit?

A substantial fraction of the folks in Ottawa would defect after such an extreme violation of norms, let alone in any other capital.

Not sure if I understand your statement. A deployment of a new unstoppable super weapon would be an entrenchment of power not a dethronement.

Norms are violated all the time to very little consequence, sure, this would be on a whole other level but what could you do… what could anyone do… and that’s the point. I think people are over optimistic about the potential for collective action. I’m not the person who needs convincing that it’s a bad idea, that decision maker is in the government somewhere.

A "new unstoppable super weapon"?

This is bizarrely confused, in fact thousands of analysts have already studied the details of such a system since the 60s: https://en.wikipedia.org/wiki/Fractional_Orbital_Bombardment...

It has too many downsides to make sense to deploy.

The only scenario where it can do anything meaningful is if it's immediately used, then MAD would apply just the same.

I can't parse the rest of the comment, so I would advise you read up on the historical background if your as confused as it seems.