I addressed the post itself in another comment (https://news.ycombinator.com/reply?id=45921428&), so I'll skip that part.
I would really like to know more about these incidents at HC events. We have a lot of very complex tradeoffs within hack club involving security/privacy/safety for exactly the reasons you identified (ie, giving teenagers a very high level of agency/responsibility in running programs). However, staff try to be extremely conscious of these tradeoffs and highly attentive to the realistic risk vectors that come about in our operations.
No teenager will ever (ever!) have anything 'taken out' on them by myself or anyone else that works here. Any time things go wrong or almost go wrong, we just want to know so we can manage that risk in the future. If you are willing to share, please reach out at cwalker@hackclub.com