Why wouldn’t you trust someone with an open mind?
It’s considered very important to have an open mind. Everyone wants to be seen as open-minded, or at least not to be thought closed-minded, which is the ultimate insult to anyone’s intellectual honesty. I’m not about to argue with that – being prepared to be corrected or change your position in response to the evidence is the most basic element of the scientific method – but it’s a phrase that carries a lot of subtext.
Obviously, examining the evidence without fixed preconceptions – with an open mind – is a fundamental part of science. But when was the last time you heard a scientist pleading for someone to keep an open mind? Maybe it happens sometimes, but I can’t remember a single example. I find that very interesting.
The people who tend to put the most emphasis on people keeping an open mind are a different group entirely. They’re the conspiracy theorists, the woo-mongers and the like, people who ironically tend to be very, very certain of the truth of their chosen beliefs. Nevertheless, this poses a curious problem – if an open mind is such a good thing, as it is, what should we conclude from the fact that it’s generally advocated by fringe groups with wacky beliefs, and not mainstream scientists?
The answer becomes a little clearer when the question’s reframed slightly: Why would you appeal to someone to keep an open mind? Clearly, because the evidence isn’t sufficient to convince on its own. If there was good reason to believe something to be true based on the evidence, only an imbecile would neglect that to make an appeal which encourages people not to reach a firm conclusion. As the legal adage goes:
If you have the law, hammer the law. If you have the facts, hammer the facts. If you have neither the law nor the facts, hammer the table
If I wanted to persuade a flat-earther that the world really is round, I could appeal to the easily observable curvature of the Earth, photos from space, people who’ve circumnavigated the globe and webcams demonstrating that it can be night in one place and day in another. And that’s just for starters. What I wouldn’t do is plead for them to keep an open mind.
Scientists rarely if ever appeal for people to open their minds, not just because an open mind is the most basic of assumptions, as self-evident as breathing, but also because having an open mind is only part of the answer. The point of having an open mind is to ensure that you’re not clinging dogmatically to a position which isn’t supported by the evidence, but that still requires the evidence to make it work.
Having an open mind is a good thing, all else being equal, but perversely, if someone’s encouraging you to keep an open mind, it’s probably a good reason to be suspicious of their claims. In this context, an insistence on having an open mind most likely means that there’s no decent evidence to support their position, and what’s more, they know it.