While I don't believe in the Adam and Eve story, you don't have to be an all knowing God to know that Adam won't be able to pull out for hundreds of years with a perfect-super-furtile women designed by God himself. So, yeah, having kids was an obvious observation.
As for God allowing this to happen in the first place knowing full well all the suffering that would be brought upon billions upon billions of innocent people, well, that's not justice. That bringing hell on earth. That never made sense to me, even when I tried to convince myself.