I don't speak for everyone, but when I made reference to this in a prior post, I should have been more specific - The players don't believe in the coaching staff anymore. They don't trust that doing what the coaches are telling them to do will get them positive results.
I am not sure if you have ever been in a situation at work where you have a terrible boss, but I have - When you realize that you have been putting in extra hours and giving it your all basically for nothing, it is emotionally draining. It results in you questioning if what you are doing for that person will result in anything good moving forward, and that subconsciously effects your performance, whether you realize it or not. This doesn't make you a bad person or a person who is a "quitter". It is just human nature. Conversely, working for a great boss that you trust 100% makes coming to work a joy, and subconsciously pushes you to do things that you didn't even think you were capable of.
When I say that the players quit on the coach, it doesn't mean I think anything ill of the kids at all. They are warriors for doing what they do and I think they all gave 100% effort out there. It is a knock on the coach for putting the kids in a situation where they know they can't trust a word he says.