There's a scientist who has written a book, I've forgotten her name, and her work was developing vaccines. She said that she often saw colleagues falsifying results. Years later, when she wanted to start a family, she decided to research all the data available, going as far back as she could. At the end of it she wrote a book and did NOT vaccinate her child.
Intelligent people do not need a science degree to know what eye contact and a smile is and they don't need a degree to notice when that behaviour disappears and they don't need a science degree to figure out that the behaviour changed right after immunisation and all other things were equal, i.e. the kid didn't swallow a mercy thermometer.
You think that being patronising to thousands of parents makes you intelligent but it only makes you arrogant.