It's frustrating for any researcher. I've tried to explain quantitative and qualitative research statistics. I've tried to explain science seldom claims to be "certain" — but the public demands certainty, just like they see on television dramas.
Vaccines are valuable, important, and statistically safer than having unvaccinated children in our communities. Nothing, nothing, nothing in life is 100% safe. Sadly, humans are bad at measuring and understanding risks.