This is a false analogy.   Think more along the lines of sex selection of children by parents in some countries (China's one-child policy as one example) and the challenges and the damage that has done to their society.   Basically, the randomness of having children became subject to society biases and preferences for males over females.   This was pure practicality for a lot of people.

If nature's genetic randomness is lost then far more dangerous things will start to happen than what are now happening in China   A very big genie will be unleashed.

If you're talking about a rare condition with very serious effects on health, then the cost will probably be worth it.   For something like an MTHFR genetic defect, genetic editing isn't necessary.   I know that loads of people won't see it that way.   Well -- c'est la vie.