What a shame the militants haven't read their Koran "in context".
Yes.. it is a shame.. but Iraq came up under the British system... as opposed to the American one.. They, like Iran, have always had lots of conflict.
Islam has always been self-destructive. The various dictators who have, at various times in the past (and in the present), chosen to further the islamist calipha, have typoically been targets of opportunity for the next-in-line. I think its important to understand that the concept of an Islamic State may be largely the whim of an active imagination. History tells us that half of the rightly guided Caliphs were assassinated by other Moslems. All of them fought civil wars with other Moslems and Moslem rebels. Exactly WHEN did this wonderful State ever really exist?
It never did.
The problem with a decentralized religion as Islam has become in modern times is that everyone can choose to misinterpret the original precepts of the religion however they want, even to the extreme right or left and claim (falsely) that it is the true path of Islam.
All religions have gone through this process and continue to even until this day. Christianity went through this in the Dark Ages and Islam is in its own Dark Age, apparently never willing or able to claw its way out.