That sort of reasoning only applies to algorithms - those shatter the way glass does. Other stuff is more pliable. It's entirely possible to shoplift but there's a nonzero chance you'll get caught. Is the supermarket's security broken? There are many known attacks against it so I'd say that it is.

Notice my wording above - fundamentally broken in multiple ways - by which I mean that there are clear and articulable flaws with the model. Nonetheless it's clearly quite functional in practice.