Matt Frei reports from the scene of the US campus killings, listens to the survivors and concludes that the only question worth asking is: where next?Blacksburg, VirginiaThe last school shooting I covered also happened in the morning. It was October 2006 and a middle-aged milkman finished his night shift, got a few hours’ sleep, kissed his wife and children and then walked into an Amish village school half a mile away in Lancaster, Pennsylvania. It was a glorious late summer day. Armed with ropes, rubber gloves and gaffer tape, he let the boys go and tied the girls together. He then shot ten of them execution-style. Five died.On Monday this week, Cho Seung-hui began his killing spree at Virginia Tech at 7.15 in the morning.