Just typical of our time...

Examiner Editorial: How the FBI was blinded by political correctness | WashingtonExaminer.com:

...It is quite possible, though, the FBI agents who interviewed Tsarnaev on both occasions failed to understand what they saw and heard because that's what they were trained to do. As The Washington Examiner's Mark Flatten reported last year, FBI training manuals were systematically purged in 2011 of all references to Islam that were judged offensive by a specially created five-member panel. Three of the panel members were Muslim advocates from outside the FBI, which still refuses to make public their identities. Nearly 900 pages were removed from the manuals as a result of that review. Several congressmen were allowed to review the removed materials in 2012, on condition that they not disclose what they read to their staffs, the media, or the general public....

They probably didn't have to remove the material for it to be removed from the institutional mind. It's unlikely those agents were all trained after 2011. But they probably had absorbed the message that finding too many Islamic terrorists was not going to make them look good or make FBI happy. And that finding the mythical Tea Party terrorist was the Holy Grail, the thing to look for.