They do not inform you for a number of reasons, the most important of which is that they do not benefit from the information you think they should or could give

They do not inform you for a number of reasons, the most important of which is that they do not benefit from the information you think they should or could give you. And it could fire back. Through this lens, it becomes much easier to interpret many of the "easy things to do" that do not occur in personal and professional relationships. Think about online dating. You chat with someone, they seem interesting, but you notice something you hadn't paid enough attention to when you were too caught up in your earthly desires. Maybe they live 40 miles away from you, maybe they have bad teeth, maybe they could lose a few pounds. You, an outspoken and, in your mind, generous person, decide to tell them that they are perfectly fine, but that you prefer someone a little taller than they are, or someone of lighter build, because you have always been active and you are not sure you can share your lifestyle with them. You expect them to appreciate your candor and helpful cooking tips, but instead they tell you that you are a loser and don't know what you are missing out. What happens then is that whenever you next feel you are losing interest in the person you are chatting with, you simply delete their profile: "Oh, well."