Linux Mint downloads (briefly) compromised

>if there is a vaccination for a disease that has a low activity rate in the general public, then a vaccination for that disease could very well be more dangerous than the disease is overall.

This maybe a misunderstanding of the relevant statistics or of cause and effect, firstly a vaccine which causes more problems than it solves is not useful and so is not done in the legitimate medical field, but specifically to this case the reason that common diseases we vaccinate for are rare is _because_ we vaccinate for them, to the point of taking many diseases out of common circulation because there is not a critical mass of infectable hosts to sustain the disease organism population. Your hypothetical doesn't model anything in reality and is not useful.