I think there's a difference between doing it in theory and the actual implementation in this case. He Jiankui did it using relatively imprecise editing technol

I think there's a difference between doing it in theory and the actual implementation in this case. He Jiankui did it using relatively imprecise editing technology with unknown potential issues. That's pretty difference than a theoretical method that would prevent a child from having a disease with a guarantee of no side effects - that's the sort of thing people generally support when polled.