Kids on a team are like flowers in a bouquet, there is always one that wants to face a different way than the arranger desires.
Work hard - beat out half the team. Be committed, play fair as a team player - Beat out another quarter of the team. The last quarter is your desire and beliefs, and where you are playing.
If there is something a coach might wish to see changed in a player or team, the first place to check and see if it could not be done better is in yourself.
Coaches need to have the ability of tact - to teach the team to rub out mistakes rather than to rub them in.
An advantage to volleyball is that you have a scoreboard to tell how you have done as a team. The thing is, in life there is no scoreboard, at least not one that you can see.