Thinking about what I've seen so far I doubt it. What is the meaning of "public access" here? Gated, guarded and "operated" spaces, where you need to be paying customer for some venue, or buying a ticket?
The places themselves fenced/glass walled in to discourage suicides, stupid people throwing things down from high up, even if "only" a coin?
I mean, look at anything which comes to your mind right now, where people can go high above anything else where other people are below them. It varies, but often it is heavily fenced/walled to protect the people below.
And lastly, think of "reckless youth", and how groups/gangs of them tend to ... err ... impose dominance over places they consider "theirs".
Would you want to be there?
I don't recognize this gang thing, maybe because I don't live in a dense city (and don't recognize the attraction of it)