i worked with a mean ass old carpenter. he's long since dead. one day he was at a stop light and a guy ran up to his car shoved a knife in his face and said "give me your wallet!" he said "its in the glove box". the guy said for him to get it out. he opened the glove, pulled out a gun and said to the robber "give me your wallet!" he drove off with the idiots wallet! true story!
If it was in Brazil like @D-FENZ suggested, they put their helmets on first because Brazil has a helmet law. Ie: if ones "profession" is using a bike to rob people, they wouldn't want to lose their ability to ride.
"....a motorcycle rider caught not wearing a safety helmet, along with the fine, will be forbidden to drive for some time and will have his driving license temporarily suspended."