Where were all those upset taxpayers when iraq and afghanistan happened? Or were those examples of super successful wars?

But to your point, as a random European resident, it's not upsetting that the US is pulling back, it's upsetting that it's pulling back with so little regard for anything else. If this was the only thing, fine, i wouldn't agree but it's your call, but look at all the other stuff happening at the same time in your foreign policy and ask yourself why all those "wasteful" things existed in the first place.