Of course, the answer to that question is obviously "too many." This sort of tragedy is completely avoidable, and should never, ever happen. Not even once. But it has, and it still does.
It's never a good thing when a building burns down. The best case scenario is no people are hurt as stuff can always be replaced. However, one Midwest building burnt down and the "stuff" was very unique including a limousine and a Lamborghini kit car.
Money Geek has published a list of the 10 most stolen vehicle makes and models in Illinois, and you probably have one sitting in your driveway right now.