What Should be Allowed and Outlawed in a World of Genetic Engineering?

In 1978, the first "test tube baby" was born. By 2017, babies born by in vitro fertilization (IVF) were 1.7% of all babies born in the US.

In 2018, 40 years after the first IVF baby, two baby girls were born whose genes had been edited. I think there is a real possibility that gene editing will become more common in 40 years than IVF is now.

Which genetic changes should be outlawed in such a world?

Which genetic changes should be allowed?

If you refuse to analyze or edit genes of your offspring and they suffer from what will then be an easily preventable genetic issue, should they be able to sue you?

Evolution to this point has been random. Will the world improve once evolution is made more intentional?