"And anyway it's just a fun song to sing-a-long with at parties."

It's the very fact that there are people who might see a song like this as a fun song that would mean it shouldn'y be sung in that kind of context.

Maybe some day when the troubles of Ireland are all behind us, fun songs might be ok, but not yet, no way.

And one reason I'd be hesitant about this song is that the worst atrocities in the Troubles in the Twenties weren't carried out by the Black and Tans or the Aiuxies - they were carried out by the Free State against Republicans in the Civil War, and that is something which has been suppressed in too many people's memories, because it is too painful to think about.