Often enough there is just no reason at all for the fence, or the reason is completely lost. So knowing why it's there is impossible, and if you condition taking down the fence on that, you are effectively prohibiting taking the fence down.
That's why every time somebody argues against it. It's because at some point you have to abandon that rule, and all the interesting discussion is about when to abandon it, not on how to follow it.
That's why every time somebody argues against it. It's because at some point you have to abandon that rule, and all the interesting discussion is about when to abandon it, not on how to follow it.