Some people did not like this ceremonious style. But after all when you have to kill a man it costs nothing to be polite. -- The Second World War, Volume III : The Grand Alliance (1950)
My Take - I've always said it's a sign of good upbringing when someone is polite and friendly to someone they have no reason to be polite and friendly with. Especially if you have to do something unpleasant to them. I guess that's why I don't approve of police who aren't professional. The guy's already going to jail or getting a ticket. If they're not being jerks themselves, why act like a jerk?