Very refreshingly put! This reminds me that I was thinking about diseases the other day, because of a family case, and when I read elsewhere that auto-immune diseases are much more common in modern societies than in unmodern ones, this is due to the progress of antibacterial and antiviral drugs and treatments. So while this is seen as progress on the one hand, at the level of bacterial and viral defence, it is a kind of regression at the level of the immune system that now, as it sees itself rid of useful bacteria and viruses, is turning against itself. Thus, research has been done on the tapeworm and there is the thesis that the tapeworm and its host have formed a symbiosis in millions of years of evolution that is useful. No matter how you twist and turn it, everything always has an effect that cannot be completely foreseen.