He's right, of course, though his column is a bit jaded: they've said it all, we've said it all, no-one's listening.
But then he gives a fine metaphor, one I suggest we use often until it becomes self evident:
Let me suggest an experiment. Take an apple or other handy piece of fruit or vegetable. Hold it in one hand. Then take a very sharp knife. Hold it in your other hand.Then, say out loud: One man’s [expletive deleted] is another man’s truth.Next, assuming that the location of the piece of fruit is a matter of personal opinion which has no relationship to spatial dimensions, slash out with the knife until you fall to the floor bleeding profusely.Congratulations, you now understand the effect of such a doctrine on the Middle East.