1) Yes, Erik is Eloquence, and has been involved in many edit wars on subjects which he has little expertise.
2) More importantly, what IS the problem? Clutch, we don't know each other, but you cannot NOT mention Wagner's anti-Semitism. It may have had little to do with his music, but Wagner very influential in the rise of German nationalist thought (of the more conservative to extreme type). Whether or not Wagner himself had anything to do with it, one cannot discuss him without at least mentioning the affinity Hitler had for his music -- the Ring cycle especially, as an ur-German saga...
3 )An historian might deal with this by saying something like, "Wagner is seen by many to have been anti-Semitic, or at least to have supported the idea of anti-Semitism This belief is generally based on one of Wagner's own works [insert name here], in which he describes the Jews as..." In this was, no one is labeling or falsely accusing anybody of anything -- just offering a generally held conclusion and the basis therefore. Speaking of which, I hope there is something similar in the article about that nice Mr. Luther...
Jules