Re: Robb and the "sassy nurse" - when a ruler/king has no long-term plans beyond attaining revenge/justice for his father via war, then his people are in a big, big trouble. It doesn't matter who started it, a decent ruler needs to have a clear picture where it should all lead long-term and how he intends to achieve it. Otherwise, all those tens of thousands of people will have suffered and died in vain, even though he was an injured party, on a personal level.
But that is not what Robb is doing. He left Winterfell to get his father and sisters back. Then his father was killed. Of course he promised to kill them all (and I think it was more a heroic blue screen of death moment then an actual plan) but he still wants his sisters back. Then he is declared "The King in the North!". Now, while it is nice to know that people follow you, it also backs him into a corner. He is not the only one who wants "Freedom". He is more the face of the revolution (so to speak). It may have started about him. But it is now about the whole North (or at least what the noble man of the north declared to be the will of the north). And Robb has no illusions about that. He said himself that his people would string him up on his shoelaces (and I think that was his sugarcoated way of saying that they would kill the fuck out of him) if he just collected his sisters and left. Great power comes with great responsibilities. That is why he cannot just exchange Jaime for his sisters. Or kill Jaime for shoving Bran out of the window.
And it is not about having no plan at all. He wants to seperate the North as a kingdom and then return and live the northern way (I guess that implies preparing for winter. I heard somewhere that it was coming). He doesn't care about the south. He doesn't care about the iron throne. He cares about what he considers "his people". And I can't fault him for not burdening himself with that too.
These are all things that Nurse Mope-Alot cannot know. But maybe in that case she should close her pie-hole. I have explained in the Completly Unspoiled Speculation Thread why her scene irk me.