+1This is arguing from personal anecdotes, not data. The reality of course is that chicken pox, measles, mumps and rubella all can and do kill children and adults--otherwise we would never have bothered to develop the vaccines. For all of these illnesses the incidence of injury or death due to the vaccine is much lower than the risk if the illness is actually contracted. This is not a difficult concept--and it means that even if vaccines have a small chance of harming your child, the responsible and reasonable thing to do is still to vaccinate them. And of course, if more parents start exempting their children, the diseases come roaring back to life and outbreaks become more common--which means you're not only putting your own child at risk, but also other people's children, some of whom may be immunocompromised and more likely to die from such infections than your healthy child is. And that's not even to mention the adults you are putting at risk, because first-time chicken pox infections are more serious in adulthood than childhood. And vaccinating against chicken pox also reduces the incidence of shingles in adults, since they're caused by the same virus.
That was probably reasonable advice at the time, but now that we've had 20 years to demonstrate the safety of the vaccine, what you are doing is putting your second son at a higher risk than necessary because you misunderstand the relative risks, and have been frightened by anti-science fearmongers who are taking advantage of your admirable instinct to protect your children in order to promote their ideology. Which is really unfortunate for everyone involved.
Probably 99.9% of them. I don't want to say 100% because there are "deviants" in every bunch. But I would bet money it's much closer to 100% than it is to 90%.
The fact that someone is making a profit off of a given product is not, in itself, evidence that product is bad for you. It's a motivation for the profiteer to hide harms caused by the product if those harms exist. It's a reason to use caution and be vigilant for abuse, not to assume the abuse is already occurring despite a lack of evidence.
In the case of vaccines we have ample evidence, from studies in multiple countries covering hundreds of thousands of individuals over many years, that the positive effects of childhood vaccination far outweigh the infrequent adverse reactions, and that vaccines unequivocally do not cause autism. There is as little controversy over these facts in the scientific community as there is over whether humans are a major contributing cause of climate change, or whether we descended from a common ancestor with chimpanzees. That is to say, essentially none.