Johnson is clearly a nut. But his actual statement isn't quite as hard-hitting as the headline
“Let me challenge you there, that’s way down the road,” Johnson said. “You’ve gotta do one step at a time. Everything you say may be true, but right now the public views the vaccines as largely safe and effective, that vaccine injuries are rare and mild. That’s the narrative, that’s what the vast majority of the public accepts. So until we get a larger percentage of the population with their eyes open to ‘woah, these vaccine injuries are real, why?’ You’ve got to do it step by step, you can’t leap to crimes against humanity, you can’t leap to another Nuremberg trial.”
He was trying to tell the guy to take it down a notch, but at the same time was saying those things 'may be true'. Still a jackass, but not as nutty as the person interviewing him making the claims. Vaccine injuries are in fact real, just not anywhere near the level anti-vaxxers make it out to be. They are very rare isolated cases, but anti's make it sound like you have a 1 in 5 shot of walking out alive.