Nazis/fash were well known meth heads. Mescaline was also available across Wien and Weimar, my great grandma used to push a little on the side.
>contempt for most people, which usually comes from externalized self hate
Sure does! Bigger question is, where does all that self hate come from? Because I've never met a person who likes to hate themself.
Could it be, perhaps, that... it's something that has been internalized first? Sort of a "seeing others hate you turns you into a hateful person" type of situation?