One of the reasons we have wrongful convictions is the enduring myth that no innocent person would ever confess to a crime he didn't commit. This myth has a basis in common sense and human self-interest, but fails to account for the psychological techniques used in police interrogations - techniques intended to break down resistance and lead to confession. Sometimes, it breaks down the resistance even of people who were actually innocent.
This is something the public should know. For more on false confessions, see this write-up by the Innocence Project.