I think the distinction is not between logical and illogical ideas, but between high-cost and low-cost ideas.
Illogical ideas are generally high-cost, for the reasons outlined in the OP, unless you live in a society in which everyone accepts the high-cost idea (for instance, Creationism in the American South). Cryonics is a high-cost idea: it may be right, but it is also deeply weird and unlikely to find acceptance among non-transhumanists. PhD physicists have high-cost ideas because of the time and effort required to understand them. Even jargon might count as a high-cost idea because of the price you pay in ease of communication, especially jargon that those outside the group tend to understand differently than those inside the group (for instance, feminists tend to use patriarchy to mean "the system of institutionalized societal sexism", while most non-feminists interpret it as meaning "all men oppressing all women").
Of course, all this is purely speculative. And the causation might go the other way: instead of adopting a high-cost idea signalling one's membership in the group, it might be that high-cost ideas tend to create groups, because low-cost ideas tend to be adopted by large numbers of people.
Of course, all this is purely speculative. And the causation might go the other way: instead of adopting a high-cost idea signalling one's membership in the group, it might be that high-cost ideas tend to create groups, because low-cost ideas tend to be adopted by large numbers of people.
My thinking is that the discussion of high cost ideas being dopey and primarily for signalling membership in a group is only partially correct, only a part of the story. In the case of physics, engineering, more applied parts of math and computer science, and probably ...
I was reading the "Professing and Cheering" article and it reminded me about some of my own ideas about the role of religious dogma as group identity badges. Here's the gist of it:
Religious and other dogmas need not make sense. Indeed, they may work better if they are not logical. Logical and useful ideas pop-up independently and spread easily, and widely accepted ideas are not very good badges. You need a unique idea to identify your group. It helps to have a somewhat costly idea as a dogma, because they are hard to fake and hard to deny. People would need to invest in these bad ideas, so they would be less likely to leave the group and confront the sunk cost. Also, it's harder to deny allegiance to the group afterwards, because no one in their right minds would accept an idea that bad for any other reason.
If you have a naive interpretation of the dogma, which regards it as an objective statement about the world, you will tend to question it. When you’re contesting the dogma, people won’t judge your argument on its merits: they will look at it as an in-group power struggle. Either you want to install your own dogma, which makes you a pretender, or you’re accepted a competing dogma, which makes you a traitor. Even if they accept that you just don’t want to yield to the authority behind the dogma, that makes you a rebel. Dogmas are just off-limits to criticism.
Public display of dismissive attitude to your questioning is also important. Taking it into consideration is in itself a form of treason, as it is interpreted as entertaining the option of joining you against the authority. So it’s best to dismiss the heresy quickly and loudly, without thinking about it.
Do you know of some other texts which shed some light on this idea?