Re: Over reach.
I haven't listened to everything Ken Livingstone has said (who has?) but I don't think he trivialised what Hitler and the Nazis did, he was just stupid enough to point out some historical reality. I can't remember him denying the holocaust, or implying that it was unimportant. You can read what he actually said yourself:
http://www.independent.co.uk/news/uk/politics/labour-anti-semitism-row-full-transcript-of-ken-livingstones-interviews-a7005311.html