EVEN IF vaccines can artificially create immunity in some cases, and therefore do some good, here is the problem with them --
"Oooh, we can give 4 or 5 vaccines to young children to help extinguish a few diseases? If 5 vaccines is good, then 50 vaccines is SUPER!
If getting rid of 5 diseases is great, then getting rid of FIFTY diseases is utterly awesome!
Let's wipe out ALL disease, pain and suffering! *insert maniacal laughter, and slapstick Looney-Tunes-esque bouncing and jumping around, including on one's head*
And so they do it. Or at least TRY to.
They fail to stop and think, that maybe there's a physical LIMIT to how much mercury a person's body can deal with, not to mention all the other things in vaccines. Just because 95% of the population can safely process (recover from) 5 vaccines doesn't mean 95% of the population can handle 10 times, or 100 times as many!
In other words, people are so simplistic. They think it's either
VACCINES GOOOOOOOOD. = The more, the merrier!
VACCINES BAAAAAAAAAD = Don't give me any vaccines.
What if they're sometimes good in rare cases, but the world has gone crazy in a Quixotic quest to avoid the consequences of Original Sin, in particular the punishment of sickness, suffering, and disease?