Compendium of the White Walkers and the Night King

[OberynBlackfyre]

Soo given what we know now just in terms of all the collective media, what do we think the White Walkers' motivation is?  

 

I think it's interesting that GRRM had always said that they aren't necessarily inherently evil.  Going by D&D terms, would that make them "Lawful Evil"?  

Also in both the show and the books, it seems like the White Walkers at least have some sort of semblance regarding culture.  There is a hierarchy, there is a language (even though many believe it to just be the Old Tongue), and they appear to be at least a LITTLE ritualistic in terms of taking offerings like Crasters sons.  


Sooo let's say they are just like a tribe of humans that became somewhat weaponized by the Children of the Forest- are they now marching simply because they want to start an ice like version of the Valyrian Empire?  Or are they doing so because they ran out of resources?  If it IS resources, then what could that be?  From all we know they don't eat (unless it's human flesh), and since they appear right at home within the cold, we can't really state that climate change would have any real affect.  

And also a question......given that the Lands of Always Winter is the furthest Northern Point (known), and Asshai is basically the most Southern/Eastern, could it be possible that the Shadowlands and Lands of Always Winter border each other at some point??