Here is a scenario that is closer to the truth about the Colorado shooting than what the media will portray. If you have read the free book available at this site, there is a fairly extensive example of how drugs are used to generate psychotic cases.
Here is the link. A short quote is below.
So for those who don’t believe any of this, simply go back to sleep and change the channel. It is not mandatory for you to understand reality in order to experience it. But for those who seek understanding and knowledge of the real forces at work in our world, keep reading.