I've seen a mugging in Brazil. They are so frequent there that everyone I talked to has been mugged on the street. Friends of mine have been carjacked and kidnapped for 8 hours.
The police won't investigate a mugging. You're wasting your time to report it.
Let's not "accept" crimes that we think are not serious. All crime needs to be investigated and appropriate punishment given. Living in a society where some crime is OK is not a great place to live.