I won't use the word "useless" here, because they are "spineless". Useless people has tried, even if they fail and become a burden. Spineless people don't even try, and demand people that have tried to cover for them. So what's the point saving them? He just said that they can safely eat there, while doing nothing. When he asked to go out gather supply, he start looking other group to latch on. If he or someone in his group has decent head, he/she will go out and create his/her own group, or take over the group. That's what I call trying. At least I hope the girls can "force" them to work if they got rescued....
And what an disappointing MC... Sure this can be used as an excuse to keep their humanity, but is it humanly to ask people that protect you, while you have little contribution to the group, to go risk themself saving unknown people? I won't bitching like this if MC has done / achieve something big for the group before he start demanding something.