The immorality of world leaders is contagious. Thank heavens for the pope | Simon Tisdall

In a political wasteland dominated by billionaires, war criminals and mega-corporations, the head of the Catholic church is a rare figure of moral leadership What do Donald Trump, Vladimir Putin and Benjamin Netanyahu have in common? Answer: a chronic inability to tell right from wrong. The three leaders currently causing the most harm in the world share a predilection for violence, a chilling lack of compassion, and extraordinary self-regard mixed with paranoia. Yet the characteristic linking them most closely is their rejection of – or failure to grasp – basic moral standards. Worse, these men typically behave, in their public lives at least, in ways that are fundamentally immoral. And that’s a problem for everyone. Their moral malaise is contagious. Ideas about what, in absolute terms, constitutes right and wrong are always contentious, as moral philosophers from Aristotle to Kant have shown. Pope Leo, leader of the world’s Catholics, warned recently that “we are living in a time when it is becoming difficult even to recognise what is truly good for everyone”. Yet most people, most of the time, observe a personal moral code held in common with others. There is broad agreement, f