No one seems to mention "who he did" either from what I can gather - a teenager (19) he picked up at the cinema in the incident he was arrested for. He was 40.
It's kinda weird to me as many in the UK wouldn't be particularly accepting of that sort of age gap now, particularly not for casual sexual liaisons. The age of consent for homosexual male sex was lowered to 18 in 1994 - that means that up until 1994 Turing's actions were illegal in the UK.
If you add in that he was privy to official secrets and would be a potential target to foreign powers then his apparent promiscuity would also be an issue of national security - I think a person in his position now would be vilified by the press and that it would be right for them to be disciplined (at least) for conduct unbecoming of an intelligence service office holder.
>remembered only as a gay man //
Whilst he's being made a poster boy for casual homosexual sex it seems people too forget he was engaged to a work colleague. Perhaps he was bisexual, it's got to be a strong possibility.
Are there any quotations from him about homosexual sex, or his lifestyle choice? Did he revel in his liaison(s) or regret them? I've not seen anything from these points apart from material that appears to have a bias towards promoting him as a model of gay pride.
If he was given a pardon this would set a very difficult precedent. Consider if cannabis is made legal in a couple of years how many pardons, and subsequent lawsuits, would that single legal change produce. Then think of all the other laws - even minor things like regrading of a speed limit on a road, the law has changed making a former activity that was prosecuted no longer illegal.
That all said I agree in general this story appears not to really be an argument about Turing. Or if it is then it's attempting to leverage a strange moral attitude that those of note should not be subject to the rule of law.