It seems that by “good Samaritans” they mean “guys who mug bank robbers”:

Sometimes even bank robbers aren’t safe on the streets.

One of them was mugged in Brooklyn by a thief who got away with his loot.

The bizarre chain of events started when Kareem Sims, 31, witnessed a robbery at the Independence Bank on Avenue U in Gravesend July 3.

Several good Samaritans chased and caught alleged thief James Boccanfusso a few blocks away. In the ensuing confusion, Sims sneaked up and grabbed money bags containing $3,000, police said.

The Samaritans were able to provide cops who busted Boccanfusso with a description of Sims, who was spotted near the bank yesterday. He was charged with robbery and possession of stolen property.