His country trained him to fight. Then he turned against it. More like him are doing the same:

STORY: The Rise of Extremism among Military and Veterans

MINI-DOCUMENTARY: Insider Threat - AP investigation finds growing extremism in the US military

While the pace at which the overall population has been radicalizing increased in recent years, people with military backgrounds have been radicalizing at a faster rate. Their extremist plots were also more likely to involve weapons training or firearms than plots that didn’t include someone with a military background, according to an Associated Press analysis of domestic terrorism data obtained exclusively by the AP.