A currently existing social norm basically says that everyone has the right to an opinion on anything, no matter how little they happen to know about the subject.
But what if we had a social norm saying that by default, people do not have the right to an opinion on anything? To earn such a right, they ought to have familiarized themselves on the topic. The familiarization wouldn't necessarily have to be anything very deep, but on the topic of e.g. controversial political issues, they'd have to have read at least a few books' worth of material discussing the question (preferrably material from both sides of the political fence). In scientific questions where one needed more advanced knowledge, you ought to at least have studied the field somewhat. Extensive personal experience on a subject would also be a way to become qualified, even if you hadn't studied the issue academically.
The purpose of this would be to enforce epistemic hygiene. Conversations on things such as public policy are frequently overwhelmed by loud declarations of opinion from people who, quite honestly, don't know anything on the subject they have a strong opinion on. If we had in place a social norm demanding an adequate amount of background knowledge on the topic before anyone voiced an opinion they expected to be taken seriously, the signal/noise ratio might be somewhat improved. This kind of a social norm does seem to already be somewhat in place in many scientific communities, but it'd do good to spread it to the general public.
At the same time, there are several caveats. As I am myself a strong advocate on freedom of speech, I find it important to note that this must remain a *social* norm, not a government-advocated one or anything that is in any way codified into law. Also, the standards must not be set *too* high - even amateurs should be able to engage in the conversation, provided that they know at least the basics. Likewise, one must be careful that the principle isn't abused, with "you don't have a right to have an opinion on this" being a generic argument used to dismiss any opposing claims.
I think this problem, if it exists, is aided by the often misguided fact/opinion distinction commonly taught in schools. It's surely useful to some extent in the context of journalism or law, but it leads to all sorts of problems in fields like ethics and science. If 'everbody's entitled to an opinion' and there are bright lines between fact and opinion, then people will feel indignant for their opinions being declared false.
Example:
"Abby: I think it's okay to set cats on fire"
"Bob: But that's clearly wrong; (insert argument here)"
"Abby: How can it be wrong; it's just my opinion!"
Clearly your doctor's opinion on how to treat your cancer is more valuable than your barber's. And the geologist's opinion on whether Europe is getting farther from North America is better than the chemist's.
Actually, I have a workaround for the kind of situation you used as your example:
Abby: I think it's okay to set cats on fire
Me: You have a very strange definition of 'okay'. (Accompanied by appropriate social signaling that it's not the good kind of strange - depending on the person I may just say outright that I don't approve of it.)
Abby's statement is actually true, assuming she's not joking or being sarcastic or something odd like that. What she thinks is not correct, if she's using a definition of 'okay' that this society would consider normal, but tha... (read more)