WHile I agree that the bombmakers should be killed, don't forget they aren't always easy to find!
As to Syria and Iran, even with a full occupation of the countries in question that just makes for larger territories to try and amintain and would certainly stretch ground force capacity at a time when it already needs more support in key areas. It would also stretch the combat zone up to Afghanistan and allow easier infiltration from the former Svoiet Islamic states who previously might not have liked the US in Iraq but had Chechenya to hand.
Leaving aside a ground invasion, an airstrikes only policy to teach them a lesson would do little to reduce this capacity since let's face it, the tech in this article doesn't require a huge complex infrastructure to produce.
Needless to say, both policies would allow America to be seen as a warmongering bully to the rest of the world and would probably multiply the number of recruits AQ or the insurgents are getting tenfold at least.
Bush is right in trying to stabilise Iraq first, though I still think more on the ground are needed. At the end of the day, Syria and Iran need to fear America enough to help combat cross border infiltration in their own interests. However, even if both govts tried with all their might for genuine, chances are it would only diminish the flow - those are long borders in rugged country. If the west can't monitor the Mexico border or equivalent areas...well how are two third world states meant to? Realistic work needs to go into better border surveillance technologies, from hidden IR and other sensors to drones, live remote surveillance and fast response units.
Rebuilding Iraq may be a b**tch in terms of tied down resources and frustration but it's the right thing to do and we don't have the luxury of waiting till the war is over. That could genuinely be years before all fightin dies down. LEaving Iraq in rubble just makes the US look bad internationally and is going to provide the enemy with plenty of recruits who will see them as having come in and smashed a state without making any effort to provide for the people there. Winning hearts and minds is a dreadful phrase, with all its associated baggage, but it is a necessary course (Albeit a very very frustrating and slow one).