Everybody wants to know what radicalized Syed Rizwan Farook and his wife before they opened fire at that office party in San Bernardino.

The FBI is actively trying to find out.

And while Assistant Director David Bowdich says they’ve come to no official conclusion, they have uncovered new information.

“We have learned and believe that both subjects were radicalized and have been for some time,” Bowdich announced.

Related: Giant cache of weapons proves U.S. is a terrorist dream come true

Which would imply this was something Syed was nursing for a while. The mass shooting wasn’t about some argument that day with a co-worker.

So where might that king of anger have come from? What kind of grudge could make someone who was born here, and seemed to be a success, turn into a monster?

CBS News Correspondent Carter Evans talked to one of Syed Farook’s co-workers &#8211 Chaz Harrison &#8211 who, unlike most of his acquaintances, had noticed that Syed was indeed very angry about a particular issue to the point that he no longer wanted to be here.

“Syed didn’t want to be in the United States because, he told me, him paying taxes was helping the United States support &#8211 basically &#8211 the war on Islam. The war on Muslims.”

He didn’t want his tax money spent on a war on Islam. Of course that’s just one person’s opinion.

However, Donald Trump has called for a total and complete shutdown of Muslim immigration to American. So if it’s true that calls for a war on Islam can radicalize otherwise ordinary Muslims … we really have a problem.