Has it occurred to you that a closed, tightly-controlled and homogeneous society like China doesn't provide an easy target? What about the fact that China is a major weapons source for jihadists, or anyone else who will fork over cold hard cash (including the Taliban, until Rumsfeld opened up a brand-new box of captured Chinese weaponry on the news just after the Taliban cut and run)? Islamists who strike China will lose the lowest cost weapons provider out there. And anyone who harbors these people will be tortured to death for information or executed (perhaps along with the male members of their families, as has happened to China's Uighur Muslims) instead of being sent to a cushy resort like Guantanamo.
Has it also occurred to you that China might also have an informal alliance with the jihadists? Note how Chinese weaponry has been found in Somalia and the Sudan.
Bottom line here is even though al Qaeda doesn't hate us for the things Giuliani says it does, it hates us for standing in the way of their takeover of Muslim governments around the world. The only way for us to redeem ourselves would be for us to deliver those governments into al Qaeda's hands. Thanks but no thanks.
The fact is that al Qaeda can't defeat those governments. But they think they can make us deliver those governments to them by attacking us. Think of how Carter made the Shah abdicate the throne in favor of the Ayatollah Khomeini. Al Qaeda figured it could speed the process along by attacking us on home ground. We are the weakest link.