The author of the study had a financial interest in his so called findings. No one could reproduce those findings, though at the behest of concerned parents, many tried. And by now everyone of any integrity has disavowed the entire episode.
By that I mean to say that Jenny McCarthy claims the whole thing is a well orchestrated plot against the good doctor Wakefield who promoted the original autism/vaccine link. Yes, every scientist working for peanuts in terms of public money has decided conspire to ruin the life of one innocent man who stood to make considerable money from his so-called discovery. Brilliant plan! (reminds me of one not-too-bright former co-worker of mine who claimed the whole global warming debate was a devious plot by scientists to make more money).
Is it possible to issue a class action lawsuit against people who cause mass public stupidity leading to demonstrable harm? In my mind, it’s not much different than the fire in a theater scenario, especially when there is no fire.