I suspect that "babykilling is OK in and of itself, but it's a visible marker for psychosis and we want to justify taking action against psychotics and therefore we criminalize babykilling anyway" isn't a particularly stable thought in human minds, and pretty quickly decomposes into "babykilling is not OK," "psychosis is not OK," "babykillers are psychotic," a 25% chance of "psychotics kill babies," and two photons.