I genuinely don't mean this in an antagonistic way, I'm honestly curious.
Are you saying this as a criticism? I know you're not a fan of Starmer, largely understandably, but what else is he meant to do? It seems to be in the best/only way to keep Trump on side and as awkward and cringeworthy as it is, surely it's in our country's best interest to be in his good books.
Politics is weird, even if it's not your "side" in charge you still tend to want them to do well for the greater good. I wasn't a fan of the Tories, but as someone in the country I wanted them to do well for the sake of us all. Presumably while not being a Starmer fan you would still want him to do well even if the way he goes about it isn't the way you would like? And as much as it's horrible to watch, joining that queue behind Trump and puckering up is surely what he has to do...
Like I say, genuinely interested and there's no dig intended. You seem a good example of someone who can have a reasonable debate with people you don't necessarily align with politically.