Your comparison of gene therapy with bloodletting and human sacrifice is preposterous.
And every new treatment has involved some failures - many people suffered adverse effects in the development of polio vaccines; dozens of people died in the race to the moon.
I guess we shouldn’t try to progress in any area, because there is always risk. But the risk averse never go forward or achieve much worthy of the genius with which God blessed us - and which I assume He intended that we USE.
I’m finished.
Give it time.
Bloodletting and human sacrifice seemed like perfectly reasonable treatments at the time.