Stop assuming anti vaccine advocates are "unscientific". Those who oppose vaccines do extensive research, look up vaccine ingredient lists, research the toxic effects of chemicals on the human body, analyze dosages, learn about immunology, and listen to countless lectures given by doctors. In short they do extensive scientific research in order to come to their conclusions. Science is by it's very nature a process of questioning and criticism. Just because there are those criticizing vaccines doesn't make them unscientific. In fact if anything it makes them more so.

Literally every anti-vaccine person I've argued with on Steemit has argued against scientific rigour and used incredibly weak, anecdotal evidence and self-selecting surveys as the basis of their argument. It is not an "assumption" when someone defends their position with unscientific and anti-scientific arguments to say that they are being unscientific. Perhaps your experience has been different, but that has been the entirety of mine.