For me, the information asymmetry is what's upsetting. Everyone's location data being free and public seems, well, ok to me. But no exceptions for any reason.
It's an interesting thought experiment to imagine such a world but for it to be viable, society would have to have very different views on a lot of things.
Maybe the abuser has a car and victim is relying on mass transit. Or maybe the victim's best bet is staying with a friend whose residence is unknown to the abuser.
The problem with open information is that those with evil intent can take precautions to ensure their activities aren't monitored.
Assuming most people on HN are good programmers, there is clearly no linkage between a person's ability to write RoR code and how to reason about normal things in the world. I'm just being honest.