People accustomed to opposing the US's many unjust or avoidable wars face a dilemma about confronting Putin's war in Ukraine.

I'm one of the former group, more or less. But I have held short of generalizing that opposition to a universal conclusion that "fighting is always simply wrong." Most of the US's wars have been power-rivalry or imperialism (and I won't be surprised if it does those again), but aiding Ukraine is an exception and we need to recognize it as one.