grzbear
What are you suggesting?
My thought is that if we kill symbiotic and/or beneficial bacteria/viri along with the so called "bad" we could end up inadvertently cutting our own throats in the process... but then is that possible?
Another possibility is one fighting these "bad" bacteria/viri to the point that we do not allow our systems to naturally adapt/develop immunity... then what happens when we are inundated with them?
Possibly, as some suggest, adaptation and human cell morphology could be the answer here.
Food for thought...