IMO, like almost every social, psychological, and cultural trait, it exists on a continuum.
For natural predispositions, I’m sure that’s true; but to the extent that the trait is a result of learning / training / experience / habit, it’s quite possible for there to be effects that push it towards one extreme or another, resulting in a bimodal distribution.
A category that comes to mind is, if there’s a behavior that people have some normally-distributed natural inclination towards, but is suppressed in most of society, and if there’s a place where that behavior is relatively unsuppressed, then (to the extent that the behavior is important to them) the people with a strong inclination to do it will move to that location, and that place will probably end up tolerating or even supporting it more, and this positive feedback loop can iterate. If the result is stable, then it might form what you could call a culture.
For natural predispositions, I’m sure that’s true; but to the extent that the trait is a result of learning / training / experience / habit, it’s quite possible for there to be effects that push it towards one extreme or another, resulting in a bimodal distribution.
A category that comes to mind is, if there’s a behavior that people have some normally-distributed natural inclination towards, but is suppressed in most of society, and if there’s a place where that behavior is relatively unsuppressed, then (to the extent that the behavior is important to them) the people with a strong inclination to do it will move to that location, and that place will probably end up tolerating or even supporting it more, and this positive feedback loop can iterate. If the result is stable, then it might form what you could call a culture.