Hello SwizzardWizard - Even if I agree with the political message/position of the song, I believe that music and politics don't mix. A historical example is the political works of the Russian composer Sergei Prokofiev. Those works are cheapened and lessened by the subject matter - vastly reducing their appeal and universality in the 21st century.
I agree with your statement SwizzardWizard. But I still maintain that politics in music reduces the aesthetic value of a work. Perhaps this is more pronounced in "high art" as compared to lower or vernacular art forms such as the subject song were are discussing.