I sometimes wish the USA would have learned the same lessons from WWII as e.g. Germany did: See, if your military or government is killing people, and you work

I sometimes wish the USA would have learned the same lessons from WWII as e.g. Germany did: See, if your military or government is killing people, and you work for them, assist them, or let them, you are also killing people. We have a saying: "Imagine it's war and nobody shows up". I fear this discussion is about if you follow the narrative that US military drone strikes are a purely defensive measure, unavoidable, or serve some greater cause. Large parts of the general public outside of the US at least are of the opinion the US military and associated mercenary companies have been (and still are?) killing (innocent) people on the other side of the world, for dubios reasons. Helping them build weapons, under this assumption, equals helping them kill people. Even the most accurate AK-47 is intended to kill people.