" Inoculate their little bodies with every possible vaccination to prevent them from even remotely naturally acquiring any resistance to diseases."
There's a reason graveyards before the mid 20th century are filled with graves of kids under 5...
There is no difference between
'vaccination accquired immunity' and
'naturally acquired immunity' other than the
'not getting sick and maybe dying' part of the latter.
Both result from your own immune system being challenged by foreign proteins.
Now I'm with you on playing in the dirt and such; this has long been known; spending hours out in the sun without sunscreen...that's something that tends not to pay off for 50 or so years when you don't end up with skin cancer.
Btw,
Koch's Postulates, which is the standard for identifying whether or not a pathogen causes a specific disease, has been shown for dozens and dozens of human viruses. Viruses are very real.