it's a privacy issue. Users who enable the feature don't understand that are basically publishing thier latitude longitude online. Which can be resolved into a home address.
Blanket stating that users don't understand is pretty dismissive and frankly quite patronising. I'm a big privacy advocate, so I don't personally like volunteering location info, but personally know lots of people who will happily do so for all sorts of reasons (e.g. seeing each other on snapchat maps), they understand what they're doing. Simple fact is, plenty of people just _don't care_ and that is their right to do so.
I think most people (including myself) may not have a good understanding what nefarious things this could be used for exactly. I don't have a stalker, and I don't think the risk of a targeted burglary is all that high in my case, what else could someone do with this to harm me?
The message posted upthread (https://i.imgur.com/PDnMmQV.png) definitely does not say it will publish your location/address. It says people will be able to view your "profile".