Thunk you both have valid points tbh. Both parties are effectively fucking things up in other parts of the world and in an ideal world you'd have another option to vote for. However if both are fucking things up for the rest of the world regardless, and you're going to be stuck with one of them either way, it makes sense to vote for who will at least somewhat (better) serve your own interests domestically.
Only way choosing to not vote will somehow work out with any result other than with one of the two in charge is if enough people choose not to vote that it forces electoral reform. And if those numbers were able to be readily mobilised then not voting wouldn't be the answer but rather finding a 3rd option they'd be comfortable voting for that serves their intersts both domestically and internationally, but that doesn't look likely to happen in the near future.
It's crazy to think in 2024 we're stuck with either the Tories or Starmer led Labour, the US with either Trump or the Dems with most of Europe trending even further to the right, but it's the world we live in. Kind of depressing to think we are headed backwards to the early to mid 20th century.