And that belief is a concern if he is wrong. AFAIK, he is wrong, so I am concerned. AFAICT his "data" is the same fabricated "MMR causes autism" data as the other anti-vaxers. If you know of something he's been pushing that's not downstream of Wakefield (or even evidence of his meaningfully revising his opinion around the Lancet's retraction) I'll give it consideration, but there's a limit to how many times I'm interested in relitigating the same questions without meaningful new data.