Good post. My opinion is somewhere in the middle - definitely not one-sided. As you could probably presume vaccines that are intended to stop an epidemic of huge proportions did lower the death rate, regarding those same diseases, that until releasing the vaccines killed many people. On the other side some vaccines lack the research that is needed to be completely sure it wouldn't harm anyone, even though at some point research would be going forever. When you takes pros and cons of vaccines, you definitely come to a conclusion that humans did increase life expectancy when starting to implement vaccines into the modern society. Every possible natural poison can become a cure, it is all about the dose. We need to research even more to help humanity! The truth is always somewhere in between. Kind regards!