⟩ Why did you choose the police career?
Take a review on the following example: "There are fewer and fewer people in the world ready themselves to fight evil for the sake of the society, which should be a work of honor and conscience. I would like to do something like that, something like a lawman can do to protect the security and safety of the society." Remember do not sound too much hyped-up when speaking like this.
And why the Police? But not others like a politician? You can answer this like Police is your career choice because people need protection from evils and crimes in the world and you urge for the safety and security of the society in a direct and positive manner.