It's not technically correct, it's blatant historicism. There has to be a physical cause for the fence. If whoever put up the fence decided that it wasn't impor

It's not technically correct, it's blatant historicism. There has to be a physical cause for the fence. If whoever put up the fence decided that it wasn't important to list the cause then their fence was ill-conceived from the start. In some cases the fact that an object survived for so long might make it unique and worth study, but a million little (usually unenforced) regulations left around like so much garbage should be swept up.