When your lawnmower wears out, honest people shop and purchase a new one. Dishonest people do the same thing except they take the lawnmower home without paying for it.
Did you ever steal your parents' car and take it out for a joy ride when you were younger? Maybe you just drove it around the block. Maybe you just drove it up and down the driveway. Or maybe you did what this 11-year-old did (but probably not.)
You figure if your car gets stolen, the thieves are going to head straight to a chop shop and get a few hundred bucks for it as quickly as possible. You don't expect this.