Robert Frost said it rightly 101 years ago. Truly good fences make good, responsible neighbors who work together to ensure safety and peace for the entire neighborhood.
This is most in violation in today's world and in recent times. If we start from the beginning of it all: Saddam Hossain in Iraq was a despot and a tyrant. He murdered many people unjustly and finally invaded Kuwait and declared it a part of his own territory. He was a mischief and he didn't uphold the sanctity of the fence as a good neighbor.
But the US didn't do that as well, for that matter. Senior Bush ultimately invaded Iraq, for WMD or whatever, in an effort to redress a wrong with yet another.
The first violator was Iraq, and that was followed by the US and its 'allies'. But the latter didn't stop there. Soon we saw the fall and devastation in Libya, Afghanistan and finally Syria. Saudi Arabia decided to join the party of 'invasion frenzy' as well, by cobbling up an 'Arab coalition' and starting to bomb Yemen.
Had all the parties maintained and upheld Frost's advisory of keeping to their own fences, none of these would've happened today. Now we have a distraught Middle East, and a perilous Europe, with war cries coming from all around.
That indicates the world must've been in the wrong set of hands. It needs a complete overhauling now.