It would contradict all we know of nature if defenceless early humans had progressed by reckless competition rather than mutual support

It is evident that it would be quite contrary to all that we know of nature if men were an exception to so general a rule: if a creature so defenceless as man was at his beginnings should have found his protection and his way to progress, not in mutual support, like other animals, but in a reckless competition for personal advantages, with no regard to the interests of the species.