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?