You are all spot on with in terms of a technical information security evaluation here.
Unfortunately, the reality is there are not enough information security specialists in the world to hire them as event security for every large public event. And even if there were, the logistics of such an event would not allow for enough time for a proper information security screening.
What you're asking for is not theoretically wrong, it's just impossible to implement.
I agree.
My argument isn’t that every event can and should build an intelligence apparatus. That would be impossible, though it would actually provide security. I agree.
My argument is that banning flipper zeros does not do anything to improve security, even if they wish it did. If they actually cared about security, it would cost them a lot more time and money. Instead, they’ve chosen theater. I don’t even have a problem with this necessarily, if it makes some people feel safer; I have a problem with anyone pretending it is security, and not theater.
When someone is given a placebo during a clinical trial, they are informed and unblinded after the trial so that they do not think they were on the actual medication; this is because otherwise, they would draw the wrong conclusion from the trial for themselves.
This is theater; that’s okay, maybe, but let’s not pretend it’s something it isn’t.
Anyway, I think we’re repeating ourselves, and I’m happy to agree to disagree.