A conclusion without evidence can be considered an unreliable lie. For example, if A tells B that C is a bad person, the correct approach for B should be to ask A for specific instances: when, where, and what bad things C has done. If A cannot provide concrete examples, it can be assumed that A is spreading an unreliable lie, rather than B subjectively joining A in condemning C. However, in real life, most people, due to a lack of logic and critical thinking, often subjectively join A in condemning C. (Of course, real-life situations are much more complex than this simplified example. The speaker usually describes many irrelevant incidents or uses interpersonal communication tactics such as trust, authority, etc., which can easily confuse the listener.)