Until we developed engines, movement of stuff was either human labor or animal labor. On top of that all the materials needed to be hand crafted – bricks, logs, stones etc. This is very slow, laborious and difficult. So scavenging material is an effective way to build stuff. Then, when a building is ruined etc, there are no bulldozers to dig up all the old stuff and cart it miles away to dump – no one had the time to do this by hand. Hence, the simplest thing to do is steal the stuff that is reusable, bury the stuff that isn’t and rebuild over the old stuff.
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