You lost me at antibiotics. Overuse is a problem for certain, but we'd have a lot more death, and possibly worse, disability without them.
Actually in my limited knowledge about biology, both are right, when things are way discompensated, you have to use things to kill bacterias which almost take control of a part of your body (the baddies one) .
Yes, more people would die. Does that mean the ones who didn't would be worse off? Less healthy?
There is a natural balance to the world order. Pushing the system, even building it up, creates strains that might not be obvious until it is catastrophically so.