The very short development cycle and lack of extended trials mean many ramifications are not manifested until a great many people are affected. By then it is way too late to reverse what may end up being lethal damage for a large number of people. Apparently one researcher has identified 20 different ways human systems are adversely affected by the experimental procedure. I don’t know if she knew of this or if it is the 21st!
https://video.twimg.com/ext_tw_video/1394860260410732547/pu/vid/576×314/eBQqOe4nAHMBUDfq.mp4?tag=12