There's a point that comes up often when discussing locks (what's their point if they can easily be opened and/or cut?), namely, that they help keeping honest people honest.

Yes, duct tape exists, but a determined stalker has much better tools anyway. The point is rather the "amateur" stalker, the one who didn't leave the house planning to stalk someone but suddenly decides to attach their backpack tag to someone's car.

Still worth pointing out that the mere existence of the Air tag enabled a level of stalking that didn't exist before.