The numbers show that the Chicken Pox vaccine should only be used on adults, yet when someone wants to skip that vaccine, they get the
information from health authorities about the lack of evidence for a connection, information about the danger of the three diseases the MMR vaccine protects against, pictures of children who had one of those three diseases, or a story about an infant who almost died from measles
speech with chicken pox replaced with Measles. In other words, they are lied to by the various health organizations. It is no wonder that people become more skeptical when they are being told horror stories that if not always outright lies, are often half truths designed to make them make decisions out of emotional fear instead of reason.
I have been saying for a long time that the pro-vaccine people are their own worst enemies when it comes to convincing people to get vaccinated. For example, the MMR vaccine. Instead of trying to convince people that Wakefield had been discredited, (which looks mighty suspicious on it's face), they should be pointing out to the parents that don't want the MMR vaccine that Wakefield did not recommend against Measles vaccines. He just advised against the mixed vaccine. Then offer individual vaccines for the same diseases that Wakefield did not accuse of causing autism. And outright stop telling parents that chicken pox will kill their children when a home cooked meal is more than 3 times more likely to kill your kid than if no one ever got immunized against the disease. Getting caught lying removes all credibility.
A lot of the complaints are simply "it doesn't work exactly the same as it did before" variety
At least that is the myth that people tell themselves when they want to think change is inherently good. The real reason is that we left the era of crappy UIs with no discoverabilty behind decades ago. The change that people don't like is being forced back into the stone age. People LOVE change that makes things better.