Government/non-government, who he worked for is irrelevant. The fact someone with a "history of medical problems" and who police say is "delusional" yet was able to obtain a gun is what's so badly wrong here. There seems to be a lot of "disturbed" people in the land of the free. So free they can go into any gun shop anywhere and walk out with a lethal weapon within minutes.
But talking of government, somewhere on YT (for anyone who wants to search it), there is a clip of a state politician giving a speech to a packed audience, who then opens a bag he had with him, took out a gun, stuck it in his mouth and blew his brains out on stage. "Disturbed/delusional" people and guns don't mix well.