For the record, I don't think the author was actually trying to defend that point, but instead to highlight how when taken out of context or in hindsight any one of our behaviors could in the future be seen as a real, unambiguously "wrong" act.
Thought experiment: Let's say hypothetically scientists discovered a drug or "vaccine" that a pregnant woman could take, which would guarantee that a male child of hers would not be gay (I'm operating under the assumption that homosexuality is caused by genetic or environmental factors and is not a free choice of the individual).
Would you be opposed to pregnant women taking this drug?
