Chesterton's meta-fence: "in our current system (democratic market economies with large governments) the common practice of taking down Chesterton fences is a process which seems well established and has a decent track record, and should not be unduly interfered with (unless you fully understand it)".
The idea has been extended to cases where no-one can articulate a good reason for the fence ( https://meteuphoric.wordpress.com/2015/09/06/mistakes-3-breaking-chestertons-fence-in-the-presence-of-bull/ ), which is a more powerful argument.
Which is not the same as nobody having put great effort into placing the fence.