And even apart from his huge influence on other composers, some of his tunes, and the way he presents them, are just irresistible, at least to me. The Tannhauser and Meistersinger overtures, the Walkurenritte, the Siegfried Idyll - great music and pure genius,
I agree at hundred percent to that. But my favorite opera by Wagner is the "Parzival" and the best music he ever has written, is the motif of Parzival, "der reine Thor", which is in a pure and simple c-major. For me this is may be the only place Wagner has shown us, that there is a bit more than obscure ideology in his soul and mind. (As we know Parzival is a seeker of the Saint Grail, that means also he is seeking for God and the pureness.) But from that pureness Wagner seems not to have the faintest idea in most of his other works!
If you compare them with the oratorios by Mendelssohn, "Elias" and "Paulus" f.ex., I only can say, that - just judged from the music itself - in Wagner we have something like the devil and in Mendelssohn we have the pure angel. So, also the music seems to attest to the mind and character of their composers.
Actually I find some of Hitlers' paintings quite pretty (even though they are not great art by any standards), and would not hesitate buying one, provided it was not more expensive than the usual price I'd pay for an amateur painting :
I see you are trying to separate the things themselves from the mind of their "creators" and I respect and appreciate that in a certain way! It´s an interesting point of view.