Tom Brokaw in ‘Unknowable Future’ (Video) is speaking about the failure of Americans to share in the sacrifices of our service men and women and their families in the wars of Iraq and Afghanistan. The "cost" of these wars are barely mentioned anywhere - especially in the media. These are wars that many seem not to recognize nor understand.
Mr. Brokaw notes in the video that we can choose to be ignorant of the wars and it would not affect our lives. And that is what it seems we so choose. Ignorance is so much easier.
See too his New York Times opinion piece.