My biggest speed bump with the whole idea entirely is the thought process behind using them at all in any capacity.
Let me clarify...
In the same mindest, it would be like trying to convince me that if I shattered both of my legs bones all the way down, and let them heal...they will be more resistant in the future to being broken! If I didn't have any broken bones in the first place....why the hell do it then at all?
I came into possession of a very old medical book, it had inserts from older medical research notes in it and it was a military doctor complaining about what the first vaccines had done to all the soldiers that came in suffering from the effects of being vaccinated. Even some suffering death prematurely in the doctor's opinion and seemed to be talking about the first influenza vaccine! Even noted how healthy they were all before that