Earlier quoted context omitted.
The US has the luxury of not being invaded by a country 3x as big. Ukraine doesn't really have the luxury of picking and choosing who is allowed to defend.
Had the Nazis been purged between 2014 and today Russia would have most likely not invaded. Least we forget that during that period Nazi death squads killed more people in the break away regions than have so far died in this war. The last time US citizens were killed abroad in large numbers by the army of another country was the Alamo and we still remember it.
Ukraine was smart not to get rid of Azov. Putin invaded once for made up reasons, no reason to think he won't do it again. Ukraine's understanding of fascist Russia's true self was correct.