Co-operativeness, as an ideal, is defective: it is right to live with reference to the community and not for oneself alone, but living for the community does not mean doing what it does. Suppose you are in a theatre which catches fire, and there is a stampede : the person who has learnt no higher morality than what is called 'co-operation' will join in the stampede since he will possess no inner force that would enable him to stand up against the herd.
Source: "Of cooperation" [From: Mortals and Others: Bertrand Russell's American Essays, 1931-1935, v.1 (1975)]
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