The man was considered stupid for several reasons. First, he called a radio program to confess to a serious crime—bank robbery—during a segment that was supposed to be about "small crimes." By doing so, he inadvertently exposed himself to law enforcement. Additionally, he described the robbery in detail, including the amount stolen and the involvement of others, which provided the authorities with clear evidence against him. Although he didn't give his name on the radio, he shared enough information for the police to trace his telephone number and identify him later. Moreover, his pride in committing such a serious crime showed a lack of understanding regarding the consequences of his actions, further highlighting his foolishness. Overall, his decision to confess publicly and provide incriminating details led to his arrest, revealing a troubling lack of foresight and common sense.