To be fair, the US has never been peaceful, and it's the country that started the most wars since WW2. It's just that it used to be in our team, and human nature makes the aggressiveness of our team justified, or at least understandable, or at least ignorable, or at least not quite changing our deep feelings.
And, at least regarding the more recent ones in Iraq and Afghanistan, Europe witnessed the largest anti-war protests in history.
From that perspective, the current "emperor is naked" development might be positive in the sense that Europe can relatively soon have enough military power to be taken seriously, and at the same time become impossible to drag into an offensive war because none of its countries wants any war and we only went there because US pressured us into - but now that the USA has became unreliable, there's no reason to sacrifice oneself.
