Or even their professions of belief to actually be something approaching truthful. But there are many incentives, both on a self-deceptive psychology level, an

Or even their professions of belief to actually be something approaching truthful. But there are many incentives, both on a self-deceptive psychology level, and on a societal-wide level, for wanting to be seen as a virtuous and forthright person irrespective of one's actual behaviours or beliefs.