Zelenskyy did win an election in 2019, an election which, as far as I can tell, was more legitimate than Russian “elections” for a long time.
That was after banning the opposition party popular in the east, though. You can argue that it's more legitimate than Russia, but that doesn't mean it's legitimate.
If you want to focus on America then fair enough.
Then I'll give you a "fair enough" too. You are closer to the situation, and there are many ambiguities that could reasonably be interpreted in different ways.
My experience is generally that there's little tolerance for nuance or for respectful disagreement on the topic. I've opposed to every military intervention the US has been involved in in my lifetime, and my impression is that the government uses military solutions as a first resort rather than the last. I might see this conflict differently if I hadn't spent 20 years trying to convince people we have no business being in Afghanistan, and if I wasn't currently trying to convince people we have no business sending bombs to Israel. I set a high bar for military interventionism.