Is it me or is the general awareness of the characters in GoT dropping a notch or two every season ?
In the first few seasons people had no trouble making sense of the situation, draw logical conclusions, communicating this to others and then act accordingly.
Jon Snow is the perpetual noob, he still seems as clueless and blindly thrashing about until luck gets fed up and drops him a hint or two, except that Snow can't take a hint unless it starts hitting him in the head hard to get through that massively thick skull of his. Compare this to Denaerys who at least had the gumption to figure out she had a good shot at being a major mover and shaker.
Bran, he's finally the three-eyed raven, but of course the whole thing had to completely shut down his amygdala, make them clear their desks and vacate the premises under armed guard because Crom forbid that he might actually make a positive contribution to fixing current problems.
Contrast this to Euron Greyjoy who gets all the breaks, can do nothing wrong and gets to keep his cake and eat it, twice, and still have cake …
We get several people, including Sansa and Arya who are going the idiot path jumping to conclusions when any sane person would have a ten minute conversation to clear certain things up.
It took a fraction of the threat that the Walkers pose to have Robb Stark gather an army and set off to war. And now that everyone who could solve the problem is coming together they can't even bother sitting down and compare notes, agree on a plan and act on it. It's like they decided that since they are all together in this they might as well use a magic 8-ball to determine every subsequent action.
White Walkers are not a threat, it's the rapidly diminishing level of competence of the characters that's getting to be a problem, except for Jon Snow, he'll never know anything, probably because his skull is all bone and nothing else.