Memetic evolution is supposedly rational, because the "carrier" is supposed to be cognizant on how much or little each meme has "benefited" (however that's supposed to be measured) him or her. Then each meme gets weeded out by people carrying them. Uh huh ( Read more... )

http://en.wikipedia.org/wiki/Somebody_Else%27s_Problem

...It's psychology, stupid.

http://www.investorhome.com/psych.htm