So, it doesn't make sense that people wouldn't put aside their petty issues to respond to the undead army that is approaching... but Snow should do exactly that and stay in the north because he allegedly suddenly loves the entire wildling culture because he's fucking one and will be murdered if he doesn't fit in with the others.
And the Wildings are attacking, and he shouldn't attack back, because, uhhh, he apparently loves them and should have just married them like omg!!! Forget the fact if they don't rebuff the wildlings their defenses will be even more weakened, and there's an undead army approaching.
Why is that Wildling army suddenly so desperate to get south of the wall, I mean, it's just a huge undead army no big deal..... errr, they're right behind me, aren't they? Totes awks! To the boats!
One of the reoccurring themes in the show is people acting on selfish, near-sighted issues to the detriment of the big picture. So, yeah, last episode of season 5. Great time to start saying it makes no sense!