Rifleman, I think it's fine that you or anyone else should sing "Eppie Moray". It doesn't speak to a uniquely Scottish experience, but to one about which any number of songs have been written in many cultures. There's not much difference between it and similar Appalachian ballads sung by any number of US bluegrass bands. There's a handful of Scots words, but that's just window dressing.

My beef is with people at sessions in US bars singing overtly political Irish songs. Irish politics is not part of the experience of anyone outside Ireland and I don't feel I or any other American has any business singing about it. We can sing about lost love, no matter whether the song comes from Ireland or Mississippi, but we should leave the immortalization of Irish heroes to the Irish.