One might as well ask 'how do you square the circle?' 'Orange' or 'Loyalist' or 'Unionist' songs were made for the same purpose as 'Rebel' or 'Republican' or 'Nationalist' songs - to make 'us' feel good about ourselves and to stick it up 'them'. Some handle it better than others so if you drop into a pub and object to the music - just leave! Presumably the patrons stay because they like it. Those most likely to be moved (one way or another) by a song are those who regard the 'troubles' as unfinished business (and I include the American Civil War).