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It's good we can actually change our opinion and I'd say it's actually more of a problem when your brain goes into a full defensive mode and is completely impermeable to arguments - extreme anti-vaxxers are a classic example of this attitude.*
* although research indicates most anti-vaxxers aren't really impermeable, they do listen to arguments, and those who apparently don't just have a financial motive (e.g. they own "natural remedy" shops).
