Dr. Sean Kirkpatrick had a few choice words for the public on his way out the door of the Pentagon’s All-domain Anomaly Resolution Office

Sean Kirkpatrick was once the man in charge of a D.C.-backed agency tasked with investigating claims into unidentified anomalous phenomena, the new term for what most people still call UFOs. He stepped down from the position in December, and has now published a excoriating farewell letter in Scientific American detailing some of the reasons why.

So why did he stop hunting for UFOs on behalf of the American government? In short: Because congressional leaders believe in conspiracy theories with absolutely no substantial proof. “Our efforts were ultimately overwhelmed by sensational but unsupported claims that ignored contradictory evidence yet captured the attention of policy makers and the public, driving legislative battles and dominating the public narrative,” Kirkpatrick said in Scientific American.