You go out, shoot a deer to survive, chop down a tree, and head home and you got some food and supplies. You go out, find a cabin, take some food and other stuff and head home and you've got some food and other supplies.
The difference is only significant if you follow the rules of society where we don't take each others stuff. But just like we don't bat an eye when we go out and take the life or supplies from an animal that is not part of society, why should a person or another creature that is not part of society think any different when they go into someones cabin and take food and supplies instead of finding the things in untouched nature? Why craft an axe from raw materials when you can just take the one that something else made that is laying right there in that log of wood?