It was a bit more complicated and chaotic than that, but you can't just brush aside US involvement as "inconsequential" like that because Euromaidan saw literal US Senators (McCain), and many other foreign nationals, interfere in the elections.
In times where every random Russian doing something remotely shady in the US is instantly connected to the Russian government as some kind of "professional agitator" this whole reasoning seems quite a bit hypocrite.
> It is like US foreign policy - they always have a good excuse to bomb some country and pretend to be the good guy saving people from a dictator.
It indeed is, that's why many people think the US is in no position to be hysterical about "election interference".
The cold war might have officially been over, but spheres of influence, and the mostly covert fight over them, still exist and persists to this day.
In that context, it's a bit like the US playing the game all the time and mostly winning, but as soon as Russia manages to win a round, the US starts complaining how evil Russia is for playing the game in the first place.
As Ukraine was a part of USSR, there are people sympathising with the West and people sympathising with Russia. And when one part comes to power, other feels disappointed.
Russia uses this distrust in its propaganda to divide the society, spreading ideas like the Ukranian government is going to ban Russian language at public schools and sadly the government doesn't take steps to reassure Russian people in Ukraine. Russian is not an official language in Ukraine or in any of its regions (except the annexed ones).
Your point about annexation of Crimea is similar to what Russian propaganda says: if we didn't take a part of Ukraine then there would be new NATO bases (another excuse: "Crimea has always been our land and people living there are mostly Russian"). But it is nothing more than an excuse - you can justify anything this way. USSR earlier did similar things - in 1939 they annexed a part of Finland [1] using an excuse that the Leningrad city was too close too the border so they needed to push the border further.
It is like US foreign policy - they always have a good excuse to bomb some country and pretend to be the good guy saving people from a dictator.
[1] https://en.wikipedia.org/wiki/Winter_War