If nobody cares where a Cessna is, why is it mandatory that everyone can find out? You could count on a fingerless glove the number of people who care where my car is, but I'd prefer not to stick that information in a public database. Some percentage of Cessna pilots prefer to keep that information private, and the rest can continue sharing that information regardless, so it would be a strictly positive-utility change. For what reason, other than the fact that Cessna pilots are a tiny minority, has this not been changed yet?

In the UK, people who are annoyed by GA plane noise will look up the owner’s details (these are held in a mandatory, public database by the CAA, equivalent to the FAA) and contact them directly.