>While he continued to post publicly, military and law enforcement ignored more than a dozen warnings phoned in by Arthur’s wife’s ex-husband about Arthur’s increasingly violent rhetoric and calls for the murder of police officers. This failure by the Guard, FBI and others to act allowed Arthur to continue to manufacture and store explosives around young children and train another extremist who would attack police officers in New York state and lead them on a wild, two-hour chase and gun battle.

This needs a congressional level investigation and whatever the president can toss at it. 

The reason why these warnings were ignored needs to be addressed.