Critical Mass - Does it mean mass murders?

Normally, I like to keep a universal perspective and have my shows stay revelant no matter when they were first broadcast, but after this last weekend of unparralled mass murders, I would like to discuss this with you.  Several ways to address this issue have been suggested -- understanding mental illness,  gun control and video games and controlling the internet.     I have another solution.  I like to get to the cause and not try to just deal with the symptoms.  What is the cause?  My solution addresses the Cause.