Was it unethical for Homo Sapiens to out-compete Neanderthals? Same concept applies here. It is merely the continued advancement of humanity biologically and genetically.
How can you know that the result is an advancement and not a regression?
Others are blind to the fact that history was not only roses and fun and people justified a lot of atrocities with "progress".
In the future, genetic enhancements will be available in a regulated competitive marketplace, and the ones that have unforseen bad consequences will fall out of favour.
Capitalism doesn't either. Capitalism answers to profits and not necessarily to _everybody_'s profits.