Are The IRA or IRA songs sectarian though? And which IRA?
Sure many, maybe even most, of those people singing those songs would be doing so for sectarian reasons.... but it's a hop, skip and a jump to label the singers of that sectarian.
Would be great if sport and politics could be kept apart but in the real world that is not possible.
The solution to this mess is science, when clear sectarian bigots are found, remove their ability to procreate so their disease can't be spread to the next generation. simple.
To find a green bigot, all you have to do is start singing "roamin in the" and see if they finish it for you.