It's a man-made evolution.
Any medicine that saves a person with an inherited disease or lifestyle-limiting condition who would have died - and then that person goes on to have kids - is exactly that. We have been screwing our gene pool for a long time now, building up bad traits that were "supposed" to kill people in the past.
Screening like this seems to be the only solution, short of allowing sick people to die when they don't really have to.
As if we knew that the end result will be beings better able to survive. Screen out all known defects and we fail to screen out the unknown ones.