I've only heard a little bit about the herd immunity. Isn't it only people who are not vaccinated that are susceptible to getting a disease?
I understand your argument but I'm also sympathetic to anti-vaxers who have had terrible experiences. I mean it isn't just a tiny amount of people who get bad reactions. I can count a lot of people I know personally who have had really strong negative reactions to vaccines, including getting the thing they were just vaccinated against. The latest example is from a friend of my mum's who did her nursing degree and started work as a nurse. She is middle aged and never in her life had the flu. She had to get a flu shot in order to work and immediately got the flu afterward. Now she gets the flu regularly. So I do sympathise with people who are afraid of the potential risks.
The flu vaccine does not contain the live flue virus so it didn't cause her to get the flu. She was likely exposed to the flu prior to getting vaccinated or caught a different strain of the flu that the vaccine wasn't made for.
The problem here is that human beings have this thing we do where we apply causation to one event that preceded another, even if there is no connection at all. It's just what we do.
Years ago, my mother went out and ate a chicken dinner at her favourite restaurant. A couple of hours later, she suffered from a burst appendix and was rushed to the hospital. To this day, my mother is completely put off by chicken dinners from that restaurant and refuses to eat it because she associates it with her terrible experience of the burst appendix. That's perfectly understandable, I think. But what is neither rational nor understandable, would be if she spent the rest of her life telling people that eating chicken dinners from that restaurant causes one's appendix to burst. Just because one thing followed after the other, doesn't mean they are in any way related.