Catch the delivery man alone. What's the problem?

Catch the delivery man who left the order. This stalk comes from a safety statement. The original words of this security guard are: "If you catch the delivery man who walks the bill, you are the security guard of the community." The security personnel in the community should catch people who act alone and ensure their safety and order in the community. This stalk was widely spread on the Internet and became a buzzword.