IQ Shredder is a dangerous concept, because it displaces "human worth" onto _individual_ fertility and offspring. If we follow that ethics a little further, we might find ourselves fully devaluating any religious practice which has an element of chastity (because it's dysgenic, obviously!), as well as condemning homosexuality along similar lines.
The fact of the matter is that, psychologically speaking on the level of a single individual, we do not seek offspring so much as pleasures, and sex and child-rearing are some of life's greatest pleasures. But that does not mean they're the exclusive sources of pleasure available in any culture, and I would warn against putting too much faith in any such notions.
The fact of the matter is that, psychologically speaking on the level of a single individual, we do not seek offspring so much as pleasures, and sex and child-rearing are some of life's greatest pleasures. But that does not mean they're the exclusive sources of pleasure available in any culture, and I would warn against putting too much faith in any such notions.