I'm not keen either. I think in our globally connected world, people feel like everywhere is part of 'their society' and so their concern. And I don't think humans handle that well. We're a very, very strongly social species, but we're designed for much smaller social groups where we have genuine personal relationships, and which we can influence.
Elon Musk isn't part of the UK. He should butt out (unless he makes the UK his full, permanent home... and stops being part of the US).
Likewise, UK people - including Mumsnetters - should butt out of US politics. I read a thread on here where people were genuinely calling on US people to rise up against Trump! It doesn't matter what we think of him, the US people elected him.