Should we encourage players to quit?

Sometimes, it seems that all we are doing is prolonging the inevitable. Our kids have been going through practice just getting by, when conditioning arises 12 player are over on the sidelines and say they can not condition due to certain reasons, but one kid even with a dislocated shoulder still conditioned. Then these kids expect to play. Our Coach likes these high numbers, but I feel if they are slacking and letting down there teamates they shouldn't even be on the field. I did tell almost all of the kids sitting out they will not play in this weeks game. Let me know your thoughts and opinions.