Public security personnel come to the property to collect owner information. Can they show their police cards? Do they need other programs? If not, can they refuse?

You did the right thing. Property companies serve the owners and must also keep personal information confidential for the owners. The public security organs need to handle cases, and the property also has the obligation to cooperate. Public security organs can only obtain evidence and residents' information through letters of introduction from public security organs, otherwise a police officer's card can't fully explain whether it is official or private interests, and the rights and interests of owners can't be guaranteed. The police officer is not in a good mood for your uncooperative, which just shows that something is wrong, otherwise it will not be difficult to open a certificate business. As for the law enforcement you mentioned, the work style has made great progress in recent years, but there are also long-term arrogant habits.