Don't forget Hitlers youth groups who were told to inform on anyone family included who were helping the allies.Often turned in their parents or neighbors.

Not so sure about that. When you read the full article about the man who turned in an attacker it turns out that the locals suspected him of being involved in robberies:

"Salem said he had hoped that the boy would give U.S. authorities the names of other criminals on Haifa Street "so that this can cool off the shooting and stealing and looting."
http://www.washingtonpost.com/wp-dyn...2003Jul31.html

Which sounds very much to me like the 'informer' was using the situation to remove a local 'pest' who may not have had anything to do with the attack...