Aren't you fucking special.
All nut jobs are not posting crazy talk on-line. This is just more of the people in power getting worried that the shit they are up to coming out and there being a revolt, this is revolt prevention.
It's tragic what this gunner did and I don't believe he had that right reasons to do what he did. One day however, if all the dirty laundry comes out, people might have a reason to force a new vote, and disrupt the governments ability to tamper with it. Naturally the government will be opposed to this, and people will protest / try to stop the government.
They want their finger on all of that so they can keep putting in 'security measures' so they can quickly silence legitimate protests and a legitimate revolution over the way the government operates.