The only thing it can really do is inform me what sort of bizarre misinformation they have bought into. Unlikely ever to repair the drop in my opinion.
I spent some time talking to antivaxxers; I've shared my impressions in a parallel subthread:
https://news.ycombinator.com/item?id=10878136
They dropped in my estimation because they allowed this emotional reaction to endanger their children.
The only thing it can really do is inform me what sort of bizarre misinformation they have bought into. Unlikely ever to repair the drop in my opinion.