Shit I made this post earlier then forgot about it.
They're all a bunch of murdering assholes.
Most of them are just there because they were recruited from prisons.
That makes sense actually. I forget that even though the Watch is supposed to instill honor on them, they're all a bunch of criminals and barely anyone chose to be there.
Because they could. Without Sam there, there was nobody to oppose, plus they've kinda been wanting to do it since day one.
Just because they could doesn't mean they would or should. Crows turning against their own, let alone the Lord Commander? I know that there's no one around to enforce it, but it would be a crime if there were a king who gave a shit.
Because the free folks killed men of the watch? Thus, in their mind, Jon let brothers die in favor for the free folks. Don't see why this is strange, really. The free folks even slaughtered everyone Olly knew.
But Jon wasn't the one who killed those men, and it wasn't like Jon was even happy or excited about having to fight with the Wildlings; he was doing it because it was the decision that wouldn't get them all killed once the Walkers show up at the Wall.
I think the pertinent issue they were trying to play up was Jon going to form an alliance with the Wildlings and bring them back south of the wall, plus having lost men in the process. The weird thing is, they said they lost Crows in that battle, but it looked like most of them made it back (there were only a handful). The rest of the Watch must know that Jon didn't "sacrifice" the men; it was something that happened and no one could have predicted it. They couldn't have lost more than 2 or 3 men, anyway.
What I'm really getting at is that it was an overblown response to what was a wise decision, even if it soured a few people.
I haven't been following this thread much, so not sure if this theory has been brought up yet, but...
I think Jon Snow was killed off for plot reasons. He's so insistent about not breaking his oath to the Night's Watch, but now that he died, he kept his oath and is no longer bound by it. Melisandre realizes Stannis is not the Warrior of Light, but somehow realizes the Warror of Light is actually Jon Snow, she then revives Jon, proclaims him the true Warrior of Light, and Jon can do what he wants, now that he's no longer bound by his oath.
I'm curious to see what happens. I don't think Jon is really dead dead just yet, either. Warg or undead - those are the two theories bouncing around in my head.