Now that reliable gene editing has been developed, it will certainly be used to eliminate hereditary diseases . To deny people this remedy would be too cruel.

I don't think it is bad in principle to make enhancements using this technology. However, designing an enhanced human that doesn't already exist is not as straightforward as replacing a defective gene with its normal counterpart. Until a number of people with a certain supposed enhancement grow up, we won't know whether the change is an enhancement or an impediment.