What Made RFK Jr. Decide to Take On Vaccine Safety (Reluctantly)?

This excerpt from "The Real RFK Jr." by Jeff Hays outlines the circumstances and the brave mothers in 2005 that caused Robert F. Kennedy Jr. to pursue vaccine safety, reluctantly, after a career pursuing environmental safety.

From the Jeff Hays Documemtary "The Real RFK Jr." (starting 1:09:00) based on the Dick Russell book of the same name.
Source:
https://rumble.com/v4ezqv9-documentary-the-real-rfk-jr.-full-movie.html
Book:
https://www.amazon.com/Real-RFK-Jr-Trials-Warrior-ebook/dp/B0BFRVWLSY