I don't think there's any way to discriminate between crazy things your mum believes and crazy things the man on the street corner believes. I also think the virulence of a meme complex, like the virulence of a virus, is very dependent on the context i.e. the population it is introduced to and the other memes it competes with in that population. "what do you think you know, and how do you think you know it?" is snappy enough to be "virulent" and, I think, not too harmful to the individual host.

I wish “likely to be beneficent, providing divine authority for behaviors that parents know to be beneficial, behaviors which provide long term rewards but not short term rewards” (for some much less than literal value of “divine”) was a good description of “those who successfully reproduce”. Unfortunately it seems like “too dumb to use a condom” is a much more accurate description. Ever seen 16 and Pregnant? (Or, [pointless dig at the interlocutor removed], who reproduces more in the present-day US, white people or black people?) http://en.wikipedia.org/wiki/Fertility_and_intelligence