I do agree, a healthy immune system will fight off influenza. Ages at risk are the very young and very old. There immune systems for many reasons can quickly become depleted. Furthermore, it's the secondary infections, pnueomina, that kills people.
I also agree that society is largely very unhealthy! Again, crusade against something that truly kills people, um alcohol maybe!
Tell that to a parent of a vaccine damaged child, or the gentleman who's hearing was damaged by being forced into an anthrax vaccine by his commanding officer... and ya alcohol does kill people, it extremely toxic-that's why it is pushed through radio and television as being cool, safe and trendy...
You could make your same argument against antibiotics.
We should just allow people's immune system to fight everything?