Who isn't assuming that? My whole point was that instead of having to recruit humans to enforce coercion, we can build our own soldiers/sailors/airmen/marines to do it.
Recruiting humans is exactly how we build our own soldiers at the moment. (Like they said in the army, "we do have a potato peeling machine - you're the latest model".) Why is another way of building soldiers bad? Only because it's new, and new is scary?
Yes, it's annoying to me that people who believe AI to be extremely dangerous forget that people themselves can already do all that nasty stuff.