Among other things, several prosecutions of accused terrorists arrested before they could blow stuff up. In almost all of these, the actual instigators were government agents working undercover, and the alleged "terrorists" who were actually put on trial were low-level accomplices who got lured (sometimes even bullied) into participating in the plot.

Here's an overview:

http://www.rollingstone.com/politics/blogs/national-affairs/...

Intermittent reports of thwarted terrorists plots (Richard Reed shoe-bombing type stuff), plus the fact that we're still at war in Afghanistan, in a standoff with Iran, occupying Iraq, and still hounding Al Qaeda everywhere we can.

Fox News, largely. You know how you see all sorts of ridiculous inaccuracies and jokes at Fox News's expense on the Internet? That's the most-watched news source in the United States.