Militaries that rely on volunteers rather than conscription absolutely don't get away with being completely authoritarian and treating regular soldiers terribly

Militaries that rely on volunteers rather than conscription absolutely don't get away with being completely authoritarian and treating regular soldiers terribly. They have to form a social contract of sorts, where people put up with some loss of autonomy in specific areas in return for other benefits like education or training, autonomy in other areas they might value more (like small team leadership), and decent service conditions. No service members tolerate regular and capricious abuse, and leaders found to do that seldom remain in post long. It's not a perfect system of course, but abusive behaviour by leadership is definitely the exception. Issues around service conditions regularly go all the way to Congress and get resolved quickly and sometimes expensively, because the alternative is being unable to recruit or retain personnel, and that would be disastrous for a military that's already having a tough time doing both. Let's not justify abusive leadership. There's never a need for it.