... when George Polya, a Hungarian professor of mathematics, once said:
"Pedantry and mastery are opposite attitudes toward rules.
To apply a rule to the letter, rigidly, unquestioningly, in cases where it fits and in cases where it does not fit, is pedantry.
To apply a rule with natural ease, with judgment, noticing the cases where it fits, and without ever letting the words of the rule obscure the purpose of the action or the opportunities of the situation, is mastery."
But I think it fits well with regard to the police 'interactions' with photographers.