Comment by miniatureape

I think the point of the fence is to move the impulse from yourself (If I can't see the reason there must not be one) to the greater context (Someone had a reason for this at some point, let me see if I can try to understand).

Related to Chesterton's fence is Levi's Onion:

https://www.joeydevilla.com/2001/12/03/4419/

Which is sort of a Chesterton's fence situation where someone took those required steps.