And, as a result of this examination," the forked pink beard smiled down gently from above, "the specialists discovered that what you call the human … - William Tenn

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And, as a result of this examination," the forked pink beard smiled down gently from above, "the specialists discovered that what you call the human race was nonviable. That is, while the individuals composing it had strongly developed instincts of self-preservation, the species as a whole was suicidal."
"Suicidal!" I found myself breathing up with rest.
"Quite. This is a matter on which there can be little argument from the more honest among you. High civilization is a product of communal living and Man, in groups, has always tended to wipe himself out. In fact, a large factor in the development of what little civilization you do experience has been the rewards contingent upon the development of mass-destruction weapons.