When teotwawki happens and all the diseases no one has really seen for several generations make a come back the anti vacciners who survive initial teotwawki die off will then start dropping like flies. Oh the irony. A bad arse prepper survives teotwawki, slaughtered hordes of zombies and then dies from a scratch by a rusty nail lol. Or has shingles so bad they can barely move and if they don't die alone in the woods from starvation, become a burden to those around them. Getting vaccinations is prepping.