Scolding Europe is a fool’s errand. When Paris, Rome, or Berlin become smoking radioactive holes courtesy of Iran, they’ll learn, but no sooner.
The oh so smart and cultured Europeans would be back up to their old tricks - backstabbing, lying, and warring - in no time at all (15 years tops) if the US were to completely disengage.
Given their weasaliness, it would be inevitable.