Ferguson, echoing a charge made by Washington Post columnist Michael Kelly, says that Pinker wants us to see [infanticide] not as a moral horror but as a genetically encoded evolutionary adaptation, as unavoidable as depth perception or opposable thumbs.
He says that infanticide should be legal because it is evolutionarily natural. 
mnli hypothesis: He says that infanticide should be legal because it is evolutionarily natural.  premise: Ferguson, echoing a charge made by Washington Post columnist Michael Kelly, says that Pinker wants us to see [infanticide] not as a moral horror but as a genetically encoded evolutionary adaptation, as unavoidable as depth perception or opposable thumbs.