A very interesting topic. First up I am Irish - live in the southern state. Was rared on rebel songs and loved them until 1969. I don't support terrorist violence and wish that those on either side would listen to the vast majority of us and dissappear.

That been said there are some rebel songs that I love. As kids my father used to sing us to sleep with The Bold Fenian Men but I always thought it was a sbout a woman plucking nettles.
Unfortunately these songs were hijacked and became non-PC.
I wonder if in these times of a peace process it is PC to dust some of them off again.
My own opinion is that it fully depends on the audience. For instance a version of The Merry Ploughboy relating to the British Army might be non-PC in Ireland. While the version "Dublin in the green" might be non-PC in England.
Although anything Irish might be non_PC after what happened in Twickenham last Saturday :-) :-)