We are all biased toward thinking we personally hold coherent views. We’re also biased toward thinking we’re average in our capabilities (amongst our in-groups

We are all biased toward thinking we personally hold coherent views. We’re also biased toward thinking we’re average in our capabilities (amongst our in-groups, at least). So it would stand to reason that those biases compose to believing our entire in-group, on average, holds coherent views. We’re rarely wise enough to estimate our own margins of error, nor self-aware enough to know our own actual capabilities relative to others.