Self Adjoint - your response is interesting in light of my question.
I have a 'friend' on another forum who is anti-vaccination. He argues that vaccines are introduced (typically) as a disease is in its decline anyway.
Why would a disease "decline"? (Self Adjoint, your answer applies.)
This article could easily be used as an argument that if a vaccine were developed for AIDS, that it was not really helping at the peak of the pandemic anyway - and that the disease would "disappear" on its own anyway.... or at least become a non-virulent form.
The whole thing just sounds funny. And I'm not particularly articulate at the moment, which doesn't help.