Easy for you to say, you must not live in the Socialist Republic of CA :-) 

It's funny that so man people feel so strongly about DOing SOMEthing about to help prevent these tragedies.  Great, what we should DO, at a federal level, is make it easier and more socially acceptable to carry concealed, or even open carry.  That is the most feasible way in my mind to minimize these events.  I buddy of mine went through the federal program for commercial pilots. He said it was very well done, about a week worth of training.  There should be a Federal Concealed Carry program of similar scope open to all (non felons etc) as a constitutional right to carry (part of bearing arms, cannot be excluded by states, valid nation-wide).

But I am preaching to the believers.