Unfounded occupation vs murderous insurgency?

from dictionary.com:
insurgency


n : an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict [syn: insurgence]

So, two days after the largest act of violence in Iraq resulted in the highest death toll, the media refers to it as the deadliest attack in the two year "insurgency". That's an insurgency that wouldn't exist if there wasn't an illegal, unethical occupation. But i guess "occupation" isn't a word we can describe the Iraq thing as in our democratic country.