We can't combat Terrorism by sending our military into Muslim countries. Doing that only exacerbates the problem, since it inevitably intensifies the anti-American sentiment that enables and fuels the terrorist threat in the first place. All of that is so basic. It's been empirically proven over and over during the last decade. It's not Noam Chomsky or Al Jazeera pointing out these basic truths, but instead, a 2004 Task Force handpicked by Donald Rumsfeld's Pentagon to review and assess the Bush administration's anti-terrorism efforts, principally the wars they were waging in Afghanistan and Iraq.
Undoubtedly, there is some small faction of "Islamic radicals" principally motivated by religious fervor which will likely hate the West regardless of what it does, but -- as the 2004 Pentagon-commissioned Report found -- their most potent weapons are American policies that inflame anti-American hatred in the Muslim world, beginning with ongoing wars waged by the U.S. military in Muslim countries. That's so self-evident it shouldn't require a report to document it, but since it seems to, here's a very credible report that does exactly that [pdf].
A Rumsfeld-era reminder about what causes Terrorism by Glenn Greenwald