The author compares and contrasts with Timothy McVeigh at the end of the piece, because he was also frustrated angry ex-military. But it came to mind that another fruitful comparison might be Charlie Manson's crazy ideas,.long inspirational chats and planning with Charlie Manson online.

They tried to get Trump to care about right-wing terrorism. He ignored them.

Officials at the Department of Homeland Security waged a years long internal struggle to get the White House to pay attention to the threat of violent domestic extremists. They ended up quitting in frustration.

One state law enforcement official said the intelligence products the Department of Homeland Security sends to its state and local partners emphasize the threat from left-wing extremists significantly more than the threat from right-wing extremists––and disproportionately so. 

By Betsy Woodruff Swan @ Politico.com, Aug. 26

[....] This story is based on background and on-record interviews with current and former law enforcement officials, inside and outside DHS. It includes, for the first time, detailed comments from two top former political appointees in the department who tried to tackle the problem before giving up on the Trump administration. Frustrated by the president’s failure to act, they are actively supporting his opponent.

“At least in this administration,” Neumann said, “there’s not going to be anything substantive done on domestic terrorism.” [....]