Hannigan is full of it. He has no sense of the reality of the times where Turing’s sexual peccadillos would have allowed the Reds to blackmail him for every kind of secret Turing could access. It didn’t have the first bleeding thing to do with intolerance or other modern concoction of cultural downfall.
Which is precisely why the soviets recruited gay spies.
Who knows how many Russians we (the west) failed to compromise because of our prudishness?
I am reminded of the way the issue is handled in Charles Stross’ “Laundry” series — gay employees are required to be thoroughly out of the closet to insure that blackmail is not possible.