Why do some fail to act in the face of atrocities?

In new emails just obtained by Allentown's "Morning Call" Newspaper, Penn State assistant football coach Mike McQueary claims that he did stop Jerry Sandusky's alleged rape of a young boy in 2002. He also says that he discussed the matter with the police.  This seems to contradict McQueary's grand jury testimony, which states that he only told Joe Paterno. Both McQueary and Paterno have been criticized for not properly informing authorities about Sandusky's actions.

Chrstine Romans speaks with clinical psychologist Jeff Gardere to try to understand why individuals choose to stay silent in the face of these kinds of atrocities.