I disagree. Many parents are concerned about cognitive effects, yes, but most parents I know are opposed to the vaccines because they are obtained from the use of aborted fetal cells as culture. So their opposition is based on morality.
Also, I would note there are ZERO studies to demonstrate the long term safety of injecting humans with DNA remnants from other humans. There are some questions starting to arise about the astronomical increase in cancers of young adults & whether that can be linked to genetic contaminants found in vaccines.
Thanks for that comment. It stirred research on my part into WI-38 and MRC-5 fetal cell lines that are used in many vaccines.