Most people didn’t tell a policeman that they were having gay sex. Turing did, so he was prosecuted. The police officer who initially arrested Turing would have had no idea about his security clearance or role in the war effort (which did not begin to be declassified until the 1970s). So what exactly is this “nuance” that you think needs to be added here? Could you at least be specific?

I’d also add that your hypothetical conviction rate of 3.2% is pretty high, considering that people generally have sex in private. As a point of comparison drawn at random, the current conviction rate for car thefts in England and Wales is 2.12%.