Seeing as the invitation was given, I think there would be pointless to risk more retaliation
To me that's just setting our future in taking whatever Trumpton decides to bully us with, just do as told to by Trump, effectively 51st State.
Royal State vistist are (supposedly) an honour for our close allies. Trump has certainly not been behaving like any sort of ally so why would the King afford him the honour. He rolls around the UK wallowing in ego whilst our businesses, public services, etc. suffer needlessly because he regards us as fodder for his bullying.
At some point we have to either accept we are his underlings or stand up for ourselves.
Starmer needs to remember that both Canada and Mexico have Free Trade Deals with the US (NAFTA as negotiated by Trump) and that was completely ignored by Trump and didn't help them in the slightest with regard to tariffs. Why does Starmer think that a UK/US Trade Deal (again negotiated with Trump) would be any help?
Ian