Wagner’s antisemitism and use of his works by the Nazis caused him to be banned in Israel: he’s not played on Israeli radio, and playing him in a classical music concert is a sure way to be booed and to be mentioned on the front page in the next day’s newspapers.
As far as i know, Wagner had sick opinions, but didn’t kill anyone.
Now: Will “Let It Be”, “Imagine” and “Jealous Guy”, produced by an alleged murderer, be banned from Israeli radio? Or from BBC? I think not.