There are plenty of great folk songs about social justice,work songs and the great political and social upheavals of our time etc.
There are also great songs in the folk tradition by writers such as Ewan Mccoll,Alistair Hulett,Dick Gaughan and Bob Dylan.
I can't think of a single folk song of the far right [ fascists,bigots or racists ] that deserves to be sung.
Ifor