Why did the children of the forest create the White Walker?

Related questions

1. Does the night King die?
2. What did night king want from bran?
3. Is Jon Snow the true heir?
4. Why did the children of the forest create the night king?
5. Was the first white walker a stark?
6. Is Aegon Targaryen the night king?
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Tags

1. #slaughtering
2. #children
3. #sacred
4. #daggers
5. #years
6. #against
7. #their
8. #cutting
9. #forest
10. #first
11. #dragonglass
12. #protection
13. #trees
14. #white
15. #these
16. #tribe
17. #thousands
18. #created
19. #chests
20. #pressed
21. #walkers
22. #create