HBO - Game of Thrones SPOILERS INSIDE. you have been warned

[Bach]

For the combat trained son of a Northern warlord, knowing the watch is hopelessly outnumbered to even leave the wildling army for a minute after he won its trust is totally idiotic. He just saved thousands and brought them with him. The nights watch numbers in the hundreds? No commander is stupid enough to throw that away and surround himself with what he knows are mutineers. He has already seen the watch turn on their commanders before. Why not, it's mostly made up of criminals dodging a dungeon cell. He knows that. He has to suspect or at least be more guarded than that unless he is a halfwit. At a minimum he should have assigned himself guards like every other military commander in the books has thus far. Even Stanis' brother was more guarded in his camp.There were probably a hundred more logical ways Martin could have killed off the character and still maintained his story line.

Anyway, I'll not debate what I consider bad writing. But when characters suddenly change nature to make a plot line work that is where you start losing me.