One should proceed with caution. We may simply not be wise enough to do some of the kinds of engineering things that people are talking about doing.
Nobody knew in advance that in vitro fertilization would be, by and large, safe.
We should never rush into folly just because other nations are practicing it.
What does it mean to be an individual? What does it mean to flourish?
We do restrict so-called reproductive freedom. We do not allow polygamy, we do not allow incest, we do not allow the buying and selling of babies.
There were certain questions about the foundations of morals that advances in science all threaten to make more complicated.