How Do The Whisperers Survive in the Winter?

Isn't that all the characters?

They migrated south during the winter.

I agree. Why spend the resources to come back north to even attempt to mess with other groups. Isn't the whole point of their group to stay living and live like the dead? Keep moving and not stop for anything? It's their rules not ours. I can understand not knowing their thoughts, but they left a severe message before the winter, they should just move on and continue their nomadic lifestyle that they want to adhere to. I understand conflict is what makes it drama but the pikes should have been the end, especially if they really want to survive with the dead like they have for years.