That's a very good observation. I think a lot of people dont realize that the Iraq war's main consequence was the spread of anti-westernization. It's become disturbingly more clear that terrorist groups can recruit disgruntled Iraqis who's homes were destroyed and loved ones' lives taken away.
I think they target those specific countries because they have governments that they presume as being potential harborers or supporters of terrorist groups. These terrorists have limited fund sources, and a group such as Al Quada make a lot of their money from donations from various religious clerics. Whenever a government or state offers to directly fund these people, it becomes a problem. a BIG problem. Because that's an easy source for development and weapons. But like I said earlier, it seems really stupid to me that any government would directly help terrorists or support their actions. That's just asking for war, and besides North Korea, none of those countries have the military capacity to withstand an all-out attack.
Saudi Arabia is kinda interesting, because a lot of Middle Eastern terrorist groups consist of Saudis. But their 'government', as far as we know, works hard at fighting terror and does not support them. It's tough to single that country out, because there are active cells and recruitment throughout the world. But there's no doubt that people are watching that region after 9/11.
"Terrorism" in itself is loosely defined by the B*sh adminstration and allied countries. For instance, I don't see how those ridiculous school shooting incidents are not considered acts of terrorism. Sometimes, it almost seems like they've planted this idea to the general public that terrorism must constitute arabic participants, which is obviously obsurd. Like you said, terrorism is impossible to overcome, and since human history, has been in full swing. But, I can agree to some extent with the current agenda to cut off potential "main" sources for funding. However, it doesnt work when we play a spin-the-bottle type approach and invade & conquer vulnerable countries without knowing ALL the facts. But there are the "little" things that can be done over a long period of time, i.e. tightening security, increased communication and intelligence technologies, an effective global anti-terror organization, and tracking all WMDs and making sure they arent in the wrong hands. If you look at the bigger picture, revitalizing third-world countries and eliminating the spread of westernization and ultimately minimizing the cultural differences from both sides of the field. There's a big terror problem within Russia we need to worry about, but I'm not sure how much attention that is receiving in comparison to middle eastern turmoil.
sorry, that was a really long post. dont take sleeping pills, just read this.