Depends what you are singing, where you are singing and to whom . Many songs are just fun and don't have a particular message, this I view as pure entertainment. Some songs tell a story or describe history etc. However I would never sing a song that had a definite message unless I felt an empathy for what the song was about.
Beware I feel that some singers sing songs that have very strong messages, hence a strong impact on their audience, purely for the sake of gaining attention from the audience. This is an ego game.
If you truely mean it then let the world know.