I still rarely see an accurate representation of the thought process of those who don't vaccinate. There is this impression that it is ignorant people who don't understand how they work, or don't understand herd immunity. There is also an impression that it is all or nothing - people either take all vaccinations, or none.
While there are extreme cases when parents think like this, for the vast majority, that is not a true picture. Most parents I know who skip vaccinations do so in a much different manner. I know of almost nobody who skips the polio vaccine. I do know people who delay it, though, not wanting to put it into an infant. MMR is taken by many. Chicken pox... not so much. HPV... not so much. But many parent simply want to let the kids grow up a couple years before doing the vaccines.
It is a risk calculation. Polio is devastating, and clearly worth the small risk presented from a vaccine. As the diseases get less and less damaging, more parents decide that the risk is greater than the potential reward, and do not choose to get that specific vaccination at that specific time.
And while the percentages of children who have adverse reactions to vaccines is small, they do exist. As a purely anecdotal story, my neighbor's child developed shingles after getting the chicken pox vaccine. They were told he may have lifelong problems because of it. Now, the doctors were astounded, and said it is an extremely rare case, practically never heard of before. But it did happen, as do other rare cases, so flat out denials that problems never happen come off as ignorant, and destroy trust between the two sides of these arguments.
So the problem with most of the comments I am seeing here is that they are bypassing the actual thought process of people who skip vaccinations, and killing avenues for potential discussion. If you want people to engage in honest discussion, you need to engage them on the risk/reward basis, providing education on the actual risks of vaccines vs. not.
The whole attitude of "If you don't vaccinate, you are an ignorant idiot." is not a good mechanism to improve communication, and does not produce positive results for anybody.