The criticism of the speculator-driven bubble theory is coming overwhelmingly from the left and the more moderate parts of the libertarian right. WHEEEEEEEEEEEEEEEEEEEEE!
I'll offer this. If you go to DailyKos and input "oil speculation" in the search function, you get 317 returns in diaries over the last quarter.
Many if not most have titles like:
http://www.dailykos.com/storyonly/2008/6/1/113658/9735
Yes, the high oil prices are due to SPECULATION
blaming the faceless business world for all woes is pretty classic behavior of the angry left.
I have to say I do not share your definition of the word "Many"; at least not as regards titles. I also note that, with the exception of mainly Jerome's diaries, "many" (my definition) of those diaries are not exactly attracting a torrent of comments.
I'm just saying I'd be loath to point to DKos as un undistorted or undistorting window into leftist thought.