Parshanut к Берешит 9:30

...And you shall be fruitful and multiply: The superficial reading of the verses is according to the baraita at the end of [the chapter entitled] Chezkat HaBatim ... Hence it states that even at a time when there is much [destruction by the] sword and spilling of blood, you should not look at that; as I will require the soul of the man - "and one who spills the blood of a man, ...his blood will be spilled. Rather "You should be fruitful and multiply," and not say, "Why should we give birth for panic and failure? It is better that [life] cease on its own!" You should not look at [it that way].