baywax said:
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I'm not sure the Golden Rule is described by "tit for tat". Tit for tat involves repayment of debt which is a form of cooperation etc
No, it does not. Tit for tat's default move, its starting point, is always cooperation. Its only after a betrayal that it self-modifies and then only as long as the betrayals continue. One on one, a betrayer always wins more, because tit for tat always forgives previous bad behavior when good behavior is present. The initial move repays nothing, and tit for tat doesn't seek to 'pay back' bad behaviour. There is no 'debt' model in tit for tat.
The golden rule derives from an understanding of how that initial move leads to cooperation, increased benefit for all.
Rules are based on observation, a good rule is something that describes and addresses a pattern, something already present. It is a description of how things work. Gravitation describes a pattern of behavior, one we then apply to new things.
We apply 'golden' rules because they benefit us, even if we don't understand why, or think to attribute the rule to the supernatural, gods, karma etc... The golden rule is no different in this sense, it simply describes the basis of a winning strategy, one that derives from the strategy of 'tit for tat'. Its not the only strategy, you don't have to use it or even all the time, but it is the most successful one, long term. Those looking for short-term gain... also benefit from the rule being used by others. They can take advantage of them, at least some of the time. One can still benefit in the prisoners dilemma by always betraying, just not as much as with tit for tat, and tit for tat only works successfully within integrated groups over the long term, as with social animals or people interested in building communities, religious or otherwise.
Altruism and self-interest are not simple opposites, they both are aspects of the same continuum of behavior and influence each other. If you insist on emotional conceptualizations, the two operate in dynamic opposition, as in: yin and yang.