just gonna point out the obvious... but in a survival situation? shaving goes right down on a guys list of priorities... like, waaaay down. So 100% realistic. Water/Food, Shelter, Direction (where to go for better survival or access to improvements to priority list) generally tend to be the order of importance... however, with the games Fog being the way it is, Shelter actually takes top spot instead. Direction is also a constant concern when there is enemy combatants, as reconning your intended direction is a major consideration.
Throw in our natural instinct of protecting "our" group... yeah, MC here is running himself into the ground, and strangely, us guys are fine with this, as this has always been man's bread and butter... also the whole reason for the old "women and children first" mentality, as it is ensuring the survival of the group, the continuation of the "us". And yeah, we will make mistakes, our mental welfare goes out the window and we tend to return to our more basic side (thus the whole reason why in a survival situation, yeah, most guys are going to fuck if that's an option, gotta ensure the genes pass on) but that's just how we roll when shit hits the fan.