The morass in Iraq may well have resulted in less trouble for the US itself than a concerted guerrilla resistance would have. All the sectarian violence, reven

The morass in Iraq may well have resulted in less trouble for the US itself than a concerted guerrilla resistance would have. All the sectarian violence, revenge killings, cleansing, etc were energy and resources expended that were not directed at US forces. Further, a large quantity of resistance directed at the US was attributed to Iranian agents, weapons and training. I'd imagine that what they could muster in defense of their own nation would dwarf what they could export to a country they didn't particularly care for.