There are two topics that are quoted - the first was 'unauthorised' photographing of children, assuming that all photographers were paedophiles, and the other being terrorism - again assuming that all photographers were terrorists casing the joint prior to an attack.
Both are unfounded for 98% (or greater) of the population, but the vague possibility that it might occur is enough to 'justify' the beliefs of the hired 'security'.
Some of the Police attempt to enforce these restrictions on public spaces, but, again, the frequency of justification is low.
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