When those beliefs are contrary to truth. Your beliefs are subject to and subservient to the truth. You don’t decide what’s true. You are not the arbiter or judge of truth. The truth pre-exists you and will outlive you. Your task is to discover the truth and be obedient to it in thought and behavior. Any belief not based in and on the truth is a false belief and therefore a lie. And you are not entitled to propagate lies. No, you are not entitled to your beliefs. You are entitled to being truthful. Nothing less, and nothing more.