Here is a good article related to the idea that "Gitmo causes terrorism" and thus, we should close the prison. I have always found this argument laughable and am glad to see someone take it on. One quote from this article in National Review that sums things up:
After 17 years of attacks, we should have learned the difference between causes of terrorism and pretexts for terrorism. Terrorism is caused, and terrorist recruitment is driven, by Islamist ideology and by American weakness in the face of terror attacks. In that sense, Senator Durbin causes more terrorism than Gitmo ever will. Terrorist organizations are encouraged when they come to believe they can win — when they come to believe they can outlast America because we lack resolve.