FFS are you misguided or just stupid? For the whole world to have immune systems capable of handing most diseases, every genetic line would have to be exposed to the virii concerned and the most affected by the virii would die, that's natural selection for you. In addition, immunity from infection is not hereditary. So diseases that don't kill, but merely maim will still exist in the same concentrations as before.
FFS stop arguing and let natural selection continue doing it's thing
In a few years we don't even have to argue about this any more because some form of virus would have wiped out the people who don't believe in vaccination.
It's simple really. What is the average age that people die at today, 50 years ago, 100 years ago and 200 years ago?
If our average life expectancy has come down compared to 100 years ago, I will start believing something the anti medicine brigade say. It's really that simple.