I think robberies often occur in Hong Kong, probably because the laws in this area in Hong Kong are not perfect. They don't have a clear definition of robbery, or Hong Kong has never really faced it, because people always think that they can get something and property as easy as blowing off dust, but when they get hot, they forget the law. It is also possible that in Hong Kong, their economic development is very backward, resulting in a group of people whose economy often cannot meet their own needs. However, Hong Kong is a land with an inch of gold, and everything needs to be bought here. But there is no good way to make money, so some people will take risks to grab it. Perhaps the definition of these robberies by the Hong Kong police is not particularly clear, and the measures taken against these robberies are not strict enough. Therefore, after the robbery, people always feel that they will not be investigated by law, so they may think that the Hong Kong police are not strong, so they think that they can avoid the pursuit of the Hong Kong police after the robbery.
Because robbery is a last resort after all, and because Hong Kong people really can't survive, they choose to take this road of no return. To sum up, this is the reason for the frequent robberies in Hong Kong.