Meta: this could do with more clarity about whether the expected answer is at the individual or societal level.
ETA
) People should really work on toughening up and growing a thicker skin, it is actually possible.
For what value of should? If you are trying to rationally motivate a system of ethics then you should (instrumentality, in order to get the job done) make it symmetrical and reciprocal. However , a de facto system of rationality can be motivate in a number of ways, including fear of punishment.
Meta: this could do with more clarity about whether the expected answer is at the individual or societal level.
ETA
For what value of should? If you are trying to rationally motivate a system of ethics then you should (instrumentality, in order to get the job done) make it symmetrical and reciprocal. However , a de facto system of rationality can be motivate in a number of ways, including fear of punishment.