It's not just vaccines - lots of examples where we do one thing to solve one problem, and it causes several problems down the road that then need to be solved f

It's not just vaccines - lots of examples where we do one thing to solve one problem, and it causes several problems down the road that then need to be solved for. draining the everglades, using ddt, importing asian carp, lionfish, releasing pythons in the everglades etc - mother nature keeps telling us that she already figured a lot of things out over millions of years, so tread carefully. Not all of those things were done deliberately to solve a problem - but they were all done by mankind, and we are still trying to recover from the after effects.