While what you say seem intuitive, it is missing one point. Those locations probably are not recording exactly who is coming and going and what they are saying/doing.
That is where this become more than just gate keeping and becomes full on tracking.
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You are saying something quite different to the comment I responded to:
> The right people to protect children are those responsible for them - their parents and guardians.
My position is that there is a social responsibility to protect children which extends to the community at large, not just their immediate guardians.
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A lot of clubs in a lot of places scan and store your ID on entrance.