The problem with the military being a necessary evil is that your own military ends up being the evil that forces others to have their own necessary evil.

Not saying the military shouldn't exist, but we should be way more careful about who ends up running it and what we let them do. Before you know it, unelected officials end up running meetings that choose where they go and who they bomb, based on intelligence gathered from other unelected officials and corporations.

Having a military is necessary.

But using it for anything other than strictly defending your own territory is not necessary. An ethical military would never set foot in any other country unless that country attacked them first (or specifically requested aid in defending themselves from a different country).

The US military is evil. There, I fixed it.