In reply to john arran:
> it's clear we arrive at very quick opinions or decisions without having had time to consciously consider them, or arrive at opinions without being aware of the underlying facts we're basing them on
This is the basis of Jonathan Haidt's thesis, which I have previously referred to.
Essentially it is that most decisions, from most people, are arrived at very quickly, on an essentially subconscious or semi-instinctive basis, the arguments to support those decisions are ex-post-factum rationalisations of conclusions already drawn and clung to with ardent dogmatism. There are probably good evolutionary reasons for this, in that in a world full of dangerous predators, decisions had to be fast and clear, if you waited too long to analyse a situation fully, you would probably have been eaten. So any decision, even the wrong one, was probably mostly better than no decision at all.
Haidt uses the metaphor of the elephant and the rider, where the elephant is the much more powerful, instinctive and above all vastly faster decision making system, the rider is the intellectual reasoning part of the process - slower, more muddy and vague. But the rider exists to serve the elephant, as the elephant is much more powerful and dominant, so the clever rider produces logical justifications for the decisions that the stronger and quicker elephant has already reached on an emotional, instinctive basis, not the other way around.
It was clear for example during Brexit arguments that the passion, the emotiveness and the venom with which both sides held their position, also the rigidity, dogmatism and inflexibility of both sides that these were visceral views, not logical ones. 2 (or more) tribes were chanting war-cries at each other, proclaiming their own virtue, power and rightness, rather than debating the most logical policy for the UK to pursue with regard to the EU. The campaign, for the very slight degree to which it influenced the end result, was essentially a process of parallel straight lines never meeting.
Tribalism and group think are natural to humanity, detached intellectual thought is foreign and secondary. Haidt argues that this can be a source of strength if one is aware of the fact and does not fall into the trap of believing that repeating ones own sacred chants ever louder will convert or frighten the opposition - all it in fact does is to strengthen their tribal reaction in the opposite direction. If you actually wish to change opinion and persuade the other tribe, you have to work WITH their elephants and not continually attack their elephants with your riders. The elephants will always win, so your riders will just annoy them not change them.
But that would require self-knowledge and some familiarity with the art of persuasion, which is conspicuous by its rarity.