This whole thing never made sense. We are supposed to believe these people are so dumb they are 100% sure some people built a big ass ice wall to prevent a bunch of raggedy smelly savages to enter their realm (which they do anyway since they're not stupid and have boats), even after witnessing the existence of undeads. And never question that idea, ever.
Also these people, murderers, rapists, thieves and what not, are suddenly very attached to some tradition and vow they have to keep and stuff. These people also think that letting thousands of your enemies die and be raised as an immortal army is the best thing to do.
I know that it's actually happening in a short time span, and they have too few shocking evidences to come to their senses, but come on.
The whole wall storyline was always boring to me because I'm supposed to accept a lot of bullshit.
I'd sooner believe someone would burn their own family to survive in the ice.
While I really like the Watch storyline in the books I agree with everything you said. I think people making the comment about us not seeing Jon talk about Hardhome in the show are missing the point, even in the books the Watch is not oblivious to the WW threat. They saw a wight try to kill Mormont and actually kill two other men, they were at the Fist of the First Men, Sam claims he killed an Other, they all remember the old stories, and when they look up they see a gigantic Wall made of Ice. Yet, these people are so dumb as to give Jon shit for letting a few thousand, half-starved wildlings through the Wall so that they don't become fodder for the Army of the dead.
Now, I can understand some Watch members reservation. Jon is talking about letting the enemy of the Watch for hundreds of years through the Wall. Men and women who have killed their brothers, who have raped villagers, burnt their crops, and carried off their daughters. People whose very names come from their black deeds which they commit against their brothers like "the Weeper." It can't be hard to suddenly be told that you have to save the same person who probably killed your best friend and then gouged out his eyes, cut his head off, and stuck it on a pike for the whole Watch to see. BUT, we're talking the end of the world here so you're going to have to make some sacrifices.
The thing about FTW is that we have to remember it's not a spontaneous moment, it's not like they learned that Jon intended to fully break his vows and march on Winterfell and decided to seize him there. It's clear that this was a plot long brewing and The Pink Letter finally broke the camel's back. The ignorance on display from the majority of the Night's Watch does kinda seem far fetched. However, sometimes I question whether that is really so out there. Like, if it was the end of the world and the Israeli's had to tear down their walls surrounding Jerusalem and let a bunch of fleeing Palestinians into the city do you really think they would do so without conflict? I don't know, but somehow I suspect it won't be like "Independence Day" where everyone just agrees to work together to kill the Aliens.
Of course, the NW v. the Wildings doesn't really have a religious bent to their conflict that would foment such hardened positions.