BLACKSBURG, Va. (AP) -- Again and again, Cho Seung-Hui says the killings at Virginia Tech could have been prevented, and that he was carrying out the shootings for "the weak and defenseless."

In a video that aired today on NBC, Cho says, "this is where it all ends. End of the road. What a life it was. Some life."

Other videos show a snarling, armed Cho railing against "rich" brats and their "hedonistic needs."

Cho sent the videos to NBC between the time he shot and killed two people in a dormitory and stormed a classroom building, where the other 30 victims were killed. The shootings ended when Cho took his own life.

NBC said the package contained a rambling and often incoherent 23-page written statement, 28 video clips and 43 photos. Several of the photos showed Cho aiming handguns at the camera.