On the issue of scientists being activists or campaigners, I think you can take that as being pretty much a fact in the specific case of public health researchers, following a comment by Richard Horton , editor of "The Lancent", recorded in a blog on the Royal Society's website in 2013:
"Should there be a separation between scientists and campaigners? Is such a separation possible? Richard Horton pointed out that for a public health researcher, not being an activist is the exception."
It would probably help if the mainstream news media treated public health researchers as being just another lobby group and didn't give them the respect that they currently do.