My husband was a victim of not being vaccinated. When he was about 3, smallpox ripped through his village and when he was five, it did so again. The first time he and his older brother caught it. The older brother died. The second time, his sister caught it. Both my husband and his sister have horrible scars from this disease. My husband has breathing problems related to the scarring. He was infertile and the high fever for a long time likely has something to do with that. Vaccination was an option for more elightened people than his parents were, just as it is an option for everyone reading this. People do still get smallpox and the scarring is no less heinous because we live in the west or have good antibiotics.
All of my kids have had all their shots, they all were in the gifted program at school, two attended college (one has graduated so far) and the youngest is in the AP classes in high school. There is/was no autism or behavior issues beyond pretty mild teenage stuff. I don't know of anyone in my circle of friends acquaintances that have any of these issues that can be related to immunizations, though I know some that have had ill babies when they used drugs or alchohol. Avoid the stupid things, but please don't fail to get your kids immunized.