There's no moral obligation on us to bring into existence lives that are good; on the other hand, if we know a life will be bad, perhaps we are under an obligation not to create it. So, perhaps, not knowing whether the lives we introduce will be good or bad, but knowing there's a significant risk they'll be bad, are we morally obliged not to risk introducing such bad lives?
Yes, I think you're right. Many will complain that this sort of thinking leads to eugenics or worse. Others will complain that all life is a gift, so there can be no bad life. Personally I think these objections can be overcome. There are major kinks that need to be straightened out, however. These kinks come in the form of ambiguities: How much risk is significant? Who decides how to weigh such risks? What constitutes a bad life? Does it mean it is a life which the live-r would be better off without? Can this really be judged ahead of time, before the individual in question is born (and thus without his or her first-hand testimony)? Will this have implications for lives that are already here and are already 'bad'? Despite these worries, I still think you're right. The abuser who cannot control his worst impulses around children, for example, ought not parent. (By the way, much of our discussion here assumes a world where teens and adults are reproductively empowered - where birth control...
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