Since it is difficult to distinguish true prophets from false, it is as well to regard all prophets with suspicion - Primo Levi

On the contrary, I believe it doesn't make much sense to say that one man is worth more than another. One man can be stronger than another but less wise. Or more educated but not so brave. Or more generous but also more stupid. So his value depends on what you want from him; a man can be very good at his job, and worthless if you set him to do some other job.

"However this war may end, we have won the war against you; none of you will be left to bear witness, but even if some of you survive, the world would not believe him. There will perhaps be suspicions, discussions, research by historians, but there will be no certainties, because we will destroy the evidence together with you. And even if some proof should remain and some of you survive, people will say that the events you describe are too monstrous to be believed: they will say they are the exaggerations of Allied propaganda and will believe us, who will deny everything, and not you. We will be the ones to dictate the history of the Lagers." — SS Officer, quoted in The Drowned and the Saved by Primo Levi

The trade of chemist (fortified, in my case, by the experience of Auschwitz), teaches you to overcome, indeed to ignore, certain revulsions that are neither necessary or congenital: matter is matter, neither noble nor vile, infinitely transformable, and its proximate origin is of no importance whatsoever. Nitrogen is nitrogen, it passes miraculously from the air into plants, from these into animals, and from animals into us; when its function in our body is exhausted, we eliminate it, but it still remains nitrogen, aseptic, innocent.