I think there's a potential irony here in that the author would probably be fine with stoner teens wandering in, in that they'd more likely be kindred spirits in their railing against the evils of The System.

Stoner teens would grow up to be part of the author's target demographic.

Your analogy would be better if it was along the lines of a corporate boardroom-stalker trespassing their way into the author's home office, complaining about how cramped it is and that the view is worthless, but then still contemplating buying it up as an investment for the future.

The author's argument (and it takes a while for the article to get there) is much more systemically fundamental than "corporate trespass good", "personal trespass bad".