"I don't know why somebody put up this fence; guess I'll tear it down"
Is entirely the wrong mindset. Until you understand why it was erected in the first place you should leave it there. Fences cost resources and time, people don't build them without a good reason. Until you know that reason you're not qualified to know if the reason still justifies the fence.
(not suggesting you're doing that here, just reflecting on human nature in general).
Yeah, human nature indeed.