From the NYT's op-ed page, a hip, Easter Sunday proverb:
Objective moral truth doesn’t exist, and ... even if it did, our grasp of it would be tenuous.
That's from science writer and psychology sleuth Matthew Hutson, author of The 7 Laws of Magical Thinking: How Irrational Beliefs Keep Us Happy, Healthy, and Sane, which I have not read (although it sounds like an indispensible investigation not into psychology, but right-wing philosophy, minus the "sane" part). As for the cognitive proverb above, I'll leave it to you to decide if the universal absence of objective moral truth is a universal truth, one dripping with moral implications.
As for me, I bend to the Taoist approach to such matters. If you're unfamiliar with Taoism, it's kind of the Episcopalianism of Asian religio-philosophy, which means it doesn't take itself too seriously. I like that. It's also profoundly nondoctrinaire, which I like even more. And when it comes to morality, Taoism scoffs, which I positively adore.
Being Chinese in origin, Taoism is characteristically loaded with paradoxes, among which there is none greater than that which addresses morality. In Taoism's exceptionally brief 'bible' of 81 chapters (the Tao Te Ching), the 18th reads, in part (from the Stephen Mitchell translation): "When the great Tao [the 'Way'] is forgotten, goodness and piety appear." Which is only to say, when a people's natural, inner ethos begins to slip away, some external, artificial morality will (must) be imposed.
Think Rick Santorum and Mike Huckabee and all the other moral fascists who possess The Answer, which we must obey, they'll lecture, if the peace is to be kept--which only confirms what Matthew Hutson observes: that even if some objective moral truth did exist, our grasp of it would be tenuous.