Recently, I engaged a couple antivaxxers on Twitter. It was a learning experience. One just wants to talk about his conspiracy theory (There is no reason for the government to care about your health!) (Uh, what about taxes?) while the other ONLY want to talk about the harm done by vaccines and ignore all the good it did (Let's talk about how many children the original Salk vaccine harmed...)
Let's be absolutely clear here: Yes, the original Salk vaccine did sicken 200 children and killed 10, but it also saved about 15000 (or even 20000) children from paralysis THAT YEAR ALONE! Go ahead, Google that yourself. A vaccine that saved 98.6+% of the children (210/15000) from a crippling disease such as polio was a success, NOT a failure!
But the anti-vaxxers only want to talk about the children that were harmed, not the 14000+ children saved that year from paralysis. They are NOT interested in seeing the whole picture.
I am not going to provide a blow-by-blow of my encounter. I'll just say that as predicted, they engaged in multiple goal-post shifting (trying to shift the topic), citing bogus experts (Mercola), claiming conspiracy theory and Galileo gambit (Wakefield and Sears), outright refuting facts ("measles is not dangerous"), name-calling ("Where are the honest provaxers?") then concluded with pigeon chess mixed with conspiracy theory ("You are stifling dissent, but you can't suppress the truth forever! ")
And this is the virtually identical pattern to the financial denialists I've engaged before. Except they want to somehow prove their pyramid or Ponzi schemes are legitimate money-making enterprises. Which pretty much proves that more than a few scammers are "financial denialists".