The comparison being made is them growing up with these parents, and suffering the consequences of it, or them dying at birth and not suffering. I don’t think those are comparable (as in, you literally can’t weight them against each other). They have totally different ways you’d evaluate their value.

Them dying at birth has almost zero cost or consequence. How do you measure against nothing? Them surviving has many costs and benefits. You can weight them against each other to argue if it’s good or bad, but you can’t compare it against oblivion. It’s like temperature. You can say it’s hot or it’s cold subjectively, but you can’t compare it against a vacuum that literally doesn’t have temperature.