I believe the Chinese police were put on the high crime area targeting Chinese tourists. Expensive hand bags, iphone, high end cameras and of course, lots of cash.
Don't think they'll follow the tourists into a restaurant or a bar or whatever.
It amazed me that this is even allowed by the local law authority. To me, it' s like a slap on the face of the Italian Police for not able to protect a foreign tourist whom came to spend money. High crime rate in certain spots of Europe and Central / South America targeting tourists. It used to be pick pocketing, now just brazing robbery.