parents who vaccinate their children without their consent are terrible parents, no exceptions.
parents who let their children die of completely preventable diseases because they think 8 year olds are capable of making their own medical decisions are terrible parents. no exceptions
I used to read stuff about vaccines that instirred some sort of wariness feel in me (don’t really know why because I don’t plan on having children anyway and I have all my vaccines already), in any case and from my utter ignorance about the subject I think people should be wary enough but not paranoid about them (and medicaments in general), in the sense of just having into account that there are medicines that one takes as common and safe and may have secondary effects that we usually don’t think about (and doctors not always mention them). In the case of children I guess it’s better to give them the vaccines to avoid preventable diseases as you say, but also parents shouldn’t forget to inform themselves about what they are giving to their children instead of just leaving everything to the doctors (not saying they don’t know what they are doing, but there are doctors and doctors, and better be informed just in case).
And these are my totally useless two cents.