Ok, so I am new and still figuring some things out here. So you build a house and you're the only one that can open the door, right? But others can hatchet their day through walls and doors, So I'm guessing the whole built structure is destructable. I see lots of destroyed houses around and wanted to see how hard it is to get into one so I smacked at my own wall about a dozen times with a hatchet and it didn't seem to do anything. How many hit's does it take to get through a wood wall? a wood door? Thanks.
The most likely reason you see these destroyed structures is because they have decayed, not been raided, the owner has not come on for quite a while so the house slowly destroys itself so the map does not get crowded.