It's not just nontrivial, it's incredibly hard. Engaging "system 2" reasoning takes a lot of effort, lowering sensitivity to, and acute awareness of, social cues and signals.
Engaging system 2 is precisely what you don't want to do, since evolutionarily speaking, a big function of system 2 is to function as a decoy/shield mechanism for keeping ideas out of a person. And increasing a person's skill at system 2 reasoning just increases their resistance to ideas.
To actually change attitudes and beliefs requires the engagement of system 1. Otherwise, even if you convince someone that something is logical, they'll stick with their emotional belief and just avoid you so they don't have to deal with the cognitive dissonance.
(Note that this principle also applies to changing your own beliefs and attitudes - it's not your logical mind that needs convincing. See Eliezer's story about overcoming a fear of lurking serial killers for an example of mapping System 2 thinking to System 1 thinking to change an emotional-level belief.)
pjeby, sorry I wasn't clear, I should have given some context. I am referencing system 1 and 2 as simplified categories of thinking as used by cognitive science, particularly in behavioral economics. Here's Daniel Kahneman discussing them. I'm not sure what you're referring to with decoys and shields, which I'll just leave at that.
To add to my quoted statement, workarounds are incredibly hard, and focusing on reasoning (system 2) about an issue or belief leaves few cycles for receiving and sending social cues and signals. While reasoning, we can pick up...
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.