@Qelix
But I fear they have saved quite some lives.
I'd argue otherwise. If this is really the norm in the sense that's even been codified, the trust between party members is going to be quite low. No wonder people were so reluctant to team up with the girl, since it offers little beyond strength in numbers. It's still every man for him(her)self. And if party members cannot trust each other, they cannot fight as effectively as a team, which can, in fact, be the difference between death and survival. So yeah, I still say the guidelines are shitty.
Of course, there can be situations when even the wounded person agrees that trying to get out with him in tow seems impossible. The enemies are just too numerous. Their resources have been depleted to an absolute minimum. Or simply he's so badly hurt that he'll likely not survive being dragged around. But that's still something that should be decided on a case-by-case basis, the guild guideline is a one-size-fits-all nonsense that does more harm than good. (And by the way, leaving someone behind is one thing, but stripping her of all weapons and rations, just to make sure she absolutely cannot survive? That's a whole different level.)