We all react to it stress differently, but logic suggests that in those already prone to irrational violent impulses the high level of stress we are subjected to and the threats posed by government can lead to the heightened paranoia which triggers violent action.
This isn't just speculation. The writings, statements and behavior of these killers consistently express a fear of government as one of their overriding concerns. Even in the sane community this has been responsible for increased political radicalism, higher gun sales and an increase in harmless paranoid behavior like "Doomsday Prepping." It's about time we admit that the actions of government play a major role in encouraging this violence.
Ironically the reaction to these incidents is invariably to try to implement more security and take away more rights. They'll want to seize guns, fortify schools and other public places, track the mentally ill,. monitor more of our communications and take away more of our rights. None of these will be very effective at solving the problem and all of them are likely to contribute to pushing more volatile people over the edge to violence.
Everyone is proposing solutions, but they are not listening to what the perpetrators of these crimes are telling us. Political agendas are driving us to the wrong answers when the real answer is pretty simple. We have created an environment which justifies the fears of the paranoid and drives them deeper down the rabbit hole. Put the blame on us for looking to government to solve social problems it can never really address effectively.
Heightened government security and economic uncertainty are the only variables which have changed. It's time to put the blame where it belongs and stop implementing government solutions which actually make the problem worse. Before we make more changes and take away more civil liberties, we should think long and hard about whether it is better do do nothing than to do more harm.