In her Pulitzer Prize-winning book, The Guns of August, Barbara Tuchman chronicled how a cascading series of seemingly minor developments led inexorably to World War I and the worst carnage known to man up to that time.
As a result, campus officials didn't send out an email alert about the first two killings until about the time Mr. Cho was preparing to continue with his carnage.
The new version works pretty much the same way the old version worked: It's a racing game where your goal is often to simply cause as much carnage as possible, hitting opponent cars and drilling pedestrians for more points and time on the clock.