I agree with you that to you (and me) in this case there is a difference.
But, who sets the scale & scope?
(I am aware that the box has been opened, it will never be closed.)
Whoever does it, hopefully it is after evidence-based discussions to establish a framework for ethical and safe application. Just because the box can’t be closed doesn’t mean we just throw our hands up and say “well, nothing we can do to steer this in a responsible direction”. We don’t breed humans like dogs to produce super men, even though we theoretically could.
>If this is successfully applied in young patients, it has the potential to prevent irreversible complications of the disease
How young is this going to be, One years old, 1 month old...
Now, compare that to editing human embryos in vitro then implanting them, just because you want to prove it's possible to use a gene editing technique to alter the genome of a person.
Moreover, identifying harmful mutations can't tell you how to build superhumans. So I think the similarity is only superficial.
Helping China to trade is not to build a totalitarian country as well. Just trade.