That was one of the things I liked about living in the Wildwoods.
Given the extent of land claimed by the City, it's impossible. But that's the whole point. They put on a show of being fair and just in the City where everyone can see but once you're out of sight, they show their true colours.
I've gotten used to just not thinking about it and my sister and Shalkin help with making sure I don't mess up. Our unicorns will appear to anyone, you just can't get too close if you're not a virgin. Though Idalia did say that while that plays a major part, it's also as much a state of mind. A truly innocent person could still approach and touch a unicorn, no matter what might have happened to them. But someone who is evil could never touch a unicorn even if they were a virgin. That ended up being very useful.