Whose morals are more important? Which morals are under threat? Most issues that affect life, ending it, sustaining, and now modifying it, are drawn from religions. While some are obviously to the benefit of all they all apply towards the living.
Gene work prior to life; yet another term with much debate; is not the real issue, it is what happens to the life that comes of it. What are the rights we will apply to a person or animal that was modified by gene edits? Animals are pretty much a wash as society only distinguishes between pets and livestock within certain societies.
So how do we address people born of this work? Are groups going to demand that certain work is never done? Just look at current news around the world for some points of contention. People are always point towards issues which they assume cannot be disputed, deadly birth defects or handicaps that prevent a self fulfilling life. However what if, provided it can be done, if groups decide to limit the number of births of one sex? Or say, should it ever be provable, if homosexuality is genetic, would we disallow removing the combination? A dictatorship that decides to create a modified race of brain addled fighting men?
Then consider all the effects on competitive areas, from sports to education. Would engineered humans be afforded the same consideration or locked out?