Where you stand depends on where you sit. If you sit in the Republican caucus, you’ll judge the logic of a Democratic speaker very stringently. If you sit in the Democratic caucus, you’ll judge the same logic much more leniently. A neutral observer might judge the same logic in a more balanced manner — but is there really such a thing as a “neutral observer”? The truth is that we don’t evaluate logic logically. We trust the logic of those we trust. We don’t trust the logic of those we don’t trust. Trust is central to the art of persuasion. Your logic will be accepted much more readily if your audience trusts you.