Why do you think an anti-war resentment, say in a country like Germany is so unusual?
In the case of a hypothetical big military conflict aka WWIII, you all KNOW that Europe and Germany in particular would be the first country to be nuked/obliterated before one bomb even falls on the US. And Germans know that too
Alone from its geography and size, war on US grounds is pretty much impossible and even in a major conflict it's more or less impossible to overrun/destroy/take the US. While in EU, all it would take is three nukes to basically make the entire area inhabitable.
You might be sitting there watching news about "some conflict" 1000s of miles away in countries most people in the US won't even know where they're located on a map. From that point of view it's "easy" to talk and wonder about the unwillingness of European countries to immediately engage in a conflict...mind you the one and only time the US saw something "war-like" in their own country was 9/11. Imagine Russia would be South America, just right across the border...and the US not larger than Texas. Then you would possibly also first think about ALL other options before jumping into conflict.
Germans know that nothing good would arise from a conflict and that so or so, the result would be the destruction of Germany and probably entire Europe, whether they aid other countries or not. There is no "winner" and the chances for a "successful outcome" (whatever that might be) of a war in the midst of EU is really slim. This is an entire different situation to you guys in the US where you can *choose* to engage in some conflict, 10.000s of miles away at the other side of the globe where you know that your country LIKELY won't be affected by it.