I would say that the common element is when the clues you have are such that the expected cost of making the allegation (in the case that it's false) is greater than the expected gain of discovering that the allegation is true. And since people find it hard to be aware of things that they hide from others, they'll often just ignore the clues rather than observe them and let the clues accumulate until the overall evidence is stronger.
Perhaps one sign of when weak clues are uncomfortable would be when the consequences of a false positive are perceived to be dire? I imagine that the examples you described would fall into this category as well.
I don't play poker much because I suck at it, but I am familiar with it and have played it before. Magic: The Gathering is my preferred game.
The last two posts suggest you are playing poker. Yes?
I would say that the common element is when the clues you have are such that the expected cost of making the allegation (in the case that it's false) is greater than the expected gain of discovering that the allegation is true. And since people find it hard to be aware of things that they hide from others, they'll often just ignore the clues rather than observe them and let the clues accumulate until the overall evidence is stronger.
Perhaps one sign of when weak clues are uncomfortable would be when the consequences of a false positive are perceived to be dire? I imagine that the examples you described would fall into this category as well.