Dianavan, That question requires a very complex answer. To put it in simple terms: The battlefield known as Iraq has become several wars in one. Outside extremist groups, (including Al Queida) who hate America, are now using it to attack the USA directly, with the advantage of operating in "friendly territory" no pun intended.

Iraqi tribal groups want to disrupt and gain control of the country, or are scared they will lose any share of financial control of assets without greater power. Have to throw in a mention of one National group; the poor bloody Kurds who get shafted by two Bush administrations as well as the Turks.

Criminals who see that it is still possible to encite local gang warfare in order to divert attention from their own agenda's.
Of course there are the religious motivated leaders who want absolute power over the country but they can be included in the tribal section if you prefer.

Then there are the mercenary countries who benefit from America failing to stabilize Iraq and its oil rich markets. They simply support any and all assholes who will get violent and cause mayhem.

Details of why the laws are in place can be obtained, by talking to any security or military experts. Who will gladly flesh out the complex problems facing the new Iraq, and its attempt at forming an elected federal, provincial and municipal form of virgin democratic administration with all this going on. For a price of course ;-)

Yours, Aye. Dave