Somewhere along the way, Robert F. Kennedy Jr. went from being a circus sideshow to a spokesman for a long list of conspiracies. He's been around as long as I can remember , talking about various scandals, fake science and such, but over the last month or so he started showing up more regularly, embraced by a ragtag group of conspiracy theorists, provocateurs, and attention-seeking billionaires. Some of them seem to at least acknowledge that what he's saying is nonsense, but in the realm of “rigorous debate,” they find his attention-seeking nonsense amusing or worse.