Case in point: a naive belief in "high moral". Bad guy (Ru) attacks good guy - bad, punish, cancel. When good guy (US) attacks bad guy - that's different, whataboutism etc. Such POV falls apart when good guy (US) attacks another good guy (EU), and while you may chose to ignore such possibility, European leaders don't (a rare case of competence on their side).
Possibility? Didn't the US sabotage Nordstream 2 a few years ago? It's pretty clear that the US isn't friendly towards Europe unless Europe behaves like a vassal.
I don't think it has anything to do with morality.
It is just leverage.