Ideally - To pass them on to others who can sing them to the world.

Realistically - Why do we sing any song? To share the joy of singing with others.

Librarians sing of the sea to landlubbers; teachers sing about life down the pit to those who may never have seen a piece of coal. Social injustice is something even the most comfortable, middle-class suburbanite will come into contact with in day-to-day life.

Singing a protest song at a singaround is akin to discussing politics in the pub. You're never going to put the world to rights but it fills the evening and just might persuade someone else to come round to your point of view.

DC