Fundementally it's perfectly valid to take a position that a system is so irredeemable that you cannot participate, but instead believe it must be torn down instead of adding legitimatecy to it. Sometimes that protest achieves something and sometimes it doesn't. It is a kantian ethics stance that you'd have to work a lot harder to invalidate than the cursory anger that folks spew out on Lemmy.

If a vote acknowledges the legitimacy in someone's view of a genocidal government, I think it's fine for them to protest against it. I'm not personally of that stance, but I don't doubt many have sincerely held beliefs.