I am from Colorado, and this is absolutely horrible that anything like this happens anywhere.  However, I have always thought about the people above me freaking out about things like this saying "how can this happen??"  "why is it always CO???"  that they are completely out of tune with the world.  There is a civil war going on in syria, a bus of jews was blown up in bulgaria, kidnappings in Mexico are rising to outrageous numbers, and multiple suicide bombings have claimed hundreds more lives in the past few months across the mid-east.
In no way do I mean to detract from the horror that was this event, but we do need to realize that we live in a relatively safe country.  I guess my point is that while fucked up things like this happen in the US, there are many fucked up events that are an integral part of life in some areas of the world.