Is it just me or did you just say socialism was an extreme ? I'm sincerely not sure I understood well (not a native english speaker). In any way, Hitler was not a socialist, he was classified as extreme right (European terminology) and banned socialist parties in the country during his "reign". Socialism promotes inclusion, tolerance and a certain control of the state over the economy to prevent the abuses of capitalism. Hitler did all the opposite, even for the last argument, as he turned the economy into a war economy, made by and for the nazis and their ideology.
Was thinking about communism. That’s what you get for only skimming things.