Bullcrap.
All factions are choosing their friends and targets only for their machiavellian benefit. The Sunni-Shia thing is something religios being played-up to keep illiterate sheeple on their masters side.
Look at this quote, from December 2002: If the Americans dared to land in Iraq, they will be dragged in quagmire because the Americans have no experience in ground battle. ... A new laboratory for modern warfare is looming in our neighborhood Iraq The source? Akbar Hashemi Rafsanjani, former President of Iran. You know, the same Iran thats been interfering in Iraq...
Cheers!
Ironically, Rafsanjani is the same guy that the libs and even some conservatives are trumpeting as the moderate alternative to Ahmadinejad.
What a farce