You need to stop watching Hollywoods version of our military, my friend.
Your post indicates inadvertently that you believe the MSM’s view that anyone in the military is a idiot dead ender that joined out of desperation, or because they can’t ‘function’ in society.
Nothing could be further from the truth.
Many troop will go along with whatever is happening and a first operation may be botched and fall apart. Such things happen in any new revolutionary force. Then the unreliables are weeded out as they show themselves to be, in fact, unreliable, and subsequent operations become more focused and efficient.