Knowing the truth is not always as easy as it sounds. Truth can be varied. Some give it in degrees of emotional response when trying to please other people. While we all want to tell the truth, most folks are very bad at it.
If I told the women in my life that their lovers were not faithful how can this help them? I have found in my own experience that matter is better left up to those in the relationships.
If I found out you are gay what does that really matter? Unless I am seeking to bed you, why would it matter to me if you are gay straight bi or transgendered? Am I a superior human?
Telling other people's personal information is not a professional attribute as some may believe. Nor is creating hostile work places by gossiping about your co-workers. There are many who believe, if they pay you an income they have the right to know everything about you. Do you believe this makes for a better employee? Perhaps the truth is, we have never lost enslavement in it's basic form?