I read a line from the crime reporter in that office. Something along the lines of not knowing how traumatizing it is to be "under your desk feeling helpless" until you have lived it.
I can't think of a better reason to support the 2A and concealed carry. Had you, or several members of your office been armed...it may not have prevented this crazy lunatic from committing this crime, but you would not, and should not be cowering under your desk feeling helpless.