Privacy is a human right, but I think it is a step too far once you ridicule people just because they don't value it as much as you do. There is nothing wrong with being "ridiculous". Who are you to judge who counts as a fool?
"The Emperor's New Clothes" (Danish: Kejserens nye klæder) is a short tale written by Danish author Hans Christian Andersen, about two weavers who promise an emperor a new suit of clothes that they say is invisible to those who are unfit for their positions, stupid, or incompetent – while in reality, they make no clothes at all, making everyone believe the clothes are invisible to them. When the emperor parades before his subjects in his new "clothes", no one dares to say that they do not see any suit of clothes on him for fear that they will be seen as stupid. Finally a child cries out, "But he isn't wearing anything at all!" The tale has been translated into over 100 languages.[1]
The point isn't...whatever you're talking about, it's that the people do value it a lot, they're just shooting themselves in the foot.
You need to be strategic about it. I've met someone with anti-vax beliefs, and pointing out her errors without mocking her worked wonders. I believe she actually changed her mind.
Strategic is mocking them to prevent their stupid ideas from spreading. (Public shaming creates a resistance at scale.)
Tactical is breaking from the general strategy to help at an atomic unit (i.e. one person).
It's pointing out that the emperor is wearing no clothes: that they're ridiculous. It may not help someone already too deep to dig themselves out, but it will probably stop at least a few people from getting on the wagon at all; no one wants to look like a fool.