Pregnant women are currently being advised to vax against whooping cough at 32 weeks, because small babies can't be vaxed and there is an epidemic which could kill them. Because others have not vaxed. And a late vax for their mothers will provide at least some immunity.
My MIL tried to persuade us not to vax DS. When my DH heard this he asked what he'd had, and when he heard "none! They're dangerous, I told you, it's all big business wanting to make money and they knew the pertussis vaccine was dangerous back in the 1970s..." he called his GP and got the lot, asap.
I could never have a relationship with someone who was against vaccination, no. There are some where the evidence is equivocal (chicken pox, for example, which is scheduled in the USA but not given here for cost/benefit reasons, plus the fact that immune adults exposed to chicken pox are believed less likely to get shingles) but the vaccinations in our schedule are important.
My mother worked for the WHO in Papua New Guinea on a study into measles vaccination for the Huli people. She said the women there walked miles to get their babies and children vaccinated and child death rates fell as a direct result. I think the fact we don't see these illnesses anymore makes us complacent. I'm so grateful for modern preventative care, and for our amazing health service, too. It saddens me that we take what are actually enormous privileges so very much for granted.