I mean the guy's right. What causes a bunch of fish to group up and move together for protection? Bigger fish. White Walkers are humanity's version of the "bigger fish". D&D said something along the lines of White Walkers don't speak, they aren't alive, they are death and nothing more. That's total bullshit, they are obviously very intelligent as they laid a trap for Waymar Royce, and SIX of them attacked one man. Re-read the prologue, watch the episode. They had wights pretend they were dead to draw him in. They didn't lay the trap for his companions, they thought Waymar was Jon Snow. D&D have a history of flat out lying to the audience.
Why do they attack "exactly" when Jon Snow goes North of the wall? Why didn't they wipe out the wildlings years ago? Why does a White Walker, and not their wights, attack Jon? Why are they so dedicated to killing him and people who look like him?
White Walkers have shown the ability to communicate, to think, and other traits. They aren't "death". They're sentient. They even had an agreement/pact with a human, Craster. That alone shows you that the HBO producers are deceiving us with that statement. If they were death, they wouldn't have dealings with humans, and wouldn't care about renewing their numbers by converting children.
It's the biggest twist of them all, when we find out the super evil ice zombies are... not really evil at all and only acting out of self-preservation. If you only had 40-200 members of a species, could you fight a war against millions? No, you'd have to use every advantage you have at your disposal which (in their case) means raising the dead as cannon fodder.
Asymmetrical warfare is when two sides use completely different tactics to win a war, often tactics which the most powerful side considers dishonorable.
Humans have dragons. The conveniently named 'Others' raise the dead. The United States has overwhelming power at sea, land, and air. The insurgents in Iraq used IEDs and suicide bombers. Same fucking concept.
The true nature and purpose of the Others and the ending of the series (Spoilers All) : asoiaf
If you really think GRRM is going to end this story with a valiant and righteous fight by humanity against mindless evil... you are deluding yourself! He fucking says this in an interview:
The war that Tolkien wrote about was a war for the fate of civilization and the future of humanity, and that's become the template. I'm not sure that it's a good template, though.
So why the fuck would his supervillain "species" be another variant of Tolkein's orcs, only stronger and more powerful? Makes no fucking sense at all. None.
White Walkers are no more evil than men.
Period. End of story. Still believe Euron Greyjoy is going to be the real villain in the last two seasons. Jon says, "The real enemy brings the storm." Euron's first lines are, "I am the storm. The first one, and the last." Euron wants control over Ice & Fire.