> You brand the stadium as a "platform" and you invite the public to treat it as such. 6 months later you have people doing drugs on one side of the stadium, holding a white supremacy rally at the other end of the stadium, and then a group of people in the bleachers playing russian roulette with the occasional casualty.

So what? People are responsible for their own individual actions. None of what you described is hurting anyone else. It may not be a pleasant place, but that's okay because it's private property. Now consider that in the digital world there's no possibility for physical harm and the example becomes entirely pointless in any case.