I'm not conflating dictatorship with systems other than capitalism.  I was merely using some examples from a well-known book that many peak oilers have read.  

My point is that we are in a situation no society has been in before, due to the power of our technology.  Certainly, people have died due to the ecological mistakes of other societies before (as Diamond points out with regard to Pitcairn and Henderson Islands).  But we're at a whole new level now.  We cannot just ignore what China or Russia or Israel or Iran decide to do, because what they do could end up exterminating us all.

Should the US be added to the list?
Absolutely.  I did not mean to blame any of the countries I named in particular.  With issues like global warming, we all contribute.  The U.S. more than most, no doubt.
ah, but Leanan, (just be Lucifer's advocate) how much food, technology, etc., does the US produce relative to the rest of the world?
I don't think it matters.  If, say, Dr. Goodstein's worst-case scenario happens, and we tip the world climate into a state "incompatible with life," will anyone care what we did to produce those emissions?  Building nuclear missiles, growing food, driving SUVs, or mass barbecuing at tailgating parties - does it matter?