Reply #30: It is really a loaded question

[safeinOhio]

Nothing could have been done to stop every case. Just like airplane crashes, the only way to stop them all is to ban airplanes. When there is a crash, we try to learn from it and make improvements to both the planes and procedures.
Where the 3 cops got ambushed, we can change how domestic calls are answered. Always at least 2 cops with the second one used as cover. Long gun out and not walking up to the door. Or some other way. Another way that may have stopped that idiot, would be to bring back the "Fairness Doctrine". The guy was into hate radio and those guys may be inciting a lot of this.
The one where 13 people were killed, find a way to identify people that are going off the deep end mentally. Offer a way to report and investigate strange behaviors.
The ones that have shot their families because of the economy could be deterred if they had hope of employment. Spend more on jobs.

In each case there is something that can be done. Just like when a plane crashes, we do something.