I was under the impression that adverse reactions to vaccines are pretty common actually? Many of the times I have gotten shots I had to wait in the room for 10-20 minutes afterwards so the nurse could verify I wasn't allergic. I think everyone should get vaccines, and they are more than safe enough for most people, but they aren't as safe as this article is implying. There are also historical examples of vaccines that caused non-trivial medical issues with segments of the population (the narcolepsy issue that occurred with a vaccine in Sweden a few years back comes to mind).