I think it is true that most people think very badly from the perspective of what a rationalist considers “good thinking” and are very bad at saying true things. This does not prevent them from understanding things I (or you) do not. But Schopenhauer is wrong about the common man of today in the west, he comes on too strong. Wit and humour are popular in movies and most people have non-sensuous pleasures (companionship and love, for example).
He does have a point though. If you thought most people are roughly equal to you in intellectual capacity then you were probably wrong. In any case it seems healthy to nurture the ability to love and respect those that are deeply inferior to you at what you care about.
I have grappled with similar feelings and issues in the past. I have not fully solved the problem but I do think I can give an answer that helps somewhat: it is usual to love entities that are much dumber than we are. Cats are a good examples, they show their stupidity constantly. And it goes beyond stupidity; if cats were people they would not be good ones. Most cats are violent, selfish, and mentally weak.
This does not stop me from loving my cat.
I am not saying “think of people as cats”, at least not fully. But I think the cat example helps nurture a positive perspective on those who have flaws you would deem abhorrent in yourself.
As others have said, another good approach is to focus on the many ways in which we are often dumb ourselves and the many qualities others have that we do not. We are deeply inferiors to others at many important things, that does not mean we don’t deserve respect. Perhaps we can use this perspective and apply it to others as we apply it to ourselves.
Also I recommend you read this post on the bucket error if you didn’t already. I think it applies.
It also seems wise to write down the content of the flight recorder as soon as possible after the event is over so the memory does not degrade too much. I suspect the kind of information the flight recorder is there for is also susceptible to being altered quickly over time (typically if you sleep before you write).