The historical blame game can be specious. You could lay the blame for all those horrendous events in Washington DC and American anti-war protesters. You could also lay the blame at the feet of the Chinese 900 years before who "pacified" the region and then were forced out. No, I think the blame for the atrocities you cite belongs to power-hungry individuals and political movements who wanted to stiffle any possibility of overthrow and wanted to eliminate those they considered traitors. I hope there is an 8th or 9th Ring of Hell for Pol Pot and his historical brethern.
What he said.
I hope this isn't inappropriate, but it left an impression on me: please consider a donation to Akira.
A perfect example of some of the effects of both the "good guys" and the "bad guys;" good intentions and bad intentions.