Wars are terrible! But as soon as you have some preference for the society you want to live in (or consider better), you might need to confront issues of violence in defense. I did not find the USSR model preferable, for example.
Most US wars are fought because of realpolitics, resources, opening markets, company contracts, like a game of Civilization, empires battling empires, or plutocrats taking over markets in poorer parts of the world through brute force foreign policy, just like in the rest of history.
There is no US exceptionalism even though i love many things uniquely about your country as a whole and wouldn't live in neo USSR ( unless part of the intelligentsia, which in some parts look like parts of the american plutocracy ).