Most people can't spot a liar. Why? The look at the facial expression.
There are individuals — who might, for instance, look most honest when they are not.
To assume the best about another is the trait that has created modern society. But we often fail to read others correctly.
Those occasions when our trusting nature is violated are tragic, for so many, the alternative — which is to abandon trust as a defense against deception — feel worse. So, the cycle of lies repeats on a loop.