Live the life of a Police Officer or a Criminal. Stop crimes or cause them. Uphold the law or break the law. In this world, the choice is yours.
If you choose to play the criminals, you will start the game in jail and have to break out before they actually get to do some actual robbing of stores. It can be pretty fun to join a server with a team of friends that are all criminals and trying to break somebody out of the prison.
On the other hand, the same amounts of fun can be had while playing as a police officer.