Well, I'm blind and I use an AirTag to find my cat. I would rather not just buy another cat. I get a lot of utility from knowing if he's inside or outside when I go to bed. This is one trivial example of millions of people every day using millions of AirTags to do small but useful things. That utility aggregates.

Using your logic we should also ban cars because cars create the novel attack vector of being able to transport someone against their will discretely in the trunk, which clearly will increase kidnappings. After all, lowering the bar for kidnapping seems like a bad tradeoff, doesn't it?

The bar is already really low. GPS trackers are just as cheap, more “real time”, and have no way for anyone to detect them unlike AirTags.

Not for the people who own stuff.