Kidnapping might not be a big threat but popular cars are often the target of carjackings. Also there are the smash and grabs. Friend of my wife's sister left her purse on the passenger seat of her minivan and someone smashed the window and grabbed it when she was stopped at a light in the not so good area of town.
I like my extended cab truck with the backwards rear doors because its so easy to flip open the back door and toss my bag under the back seat where it can't be seen.
Always keep your doors and seatbelt on and transmission in gear and empty space in front of ypu so if someone does come up to your window you can get out of there.