This isn't so much about convincing the die-hard (pun intended) anti-vaxers that they're wrong... it's probably more about explaining why they're wrong to those whose brain hasn't turned to mush yet and generally counterbalancing the bullshit.
For example, I don't think BADecker would ever admit that he's wrong, even if 200 million people don't die over the next couple of years, but it's worth pointing out how stupid that is so that some Bitcoin newbie doesn't think all bitcoiners are utter idiots.
But its fun to imagine how his pride gets shatter as his predictions for "DEATHS" didn't come.
Its like seeing kids being open to the world why/how their fairytales are not true