I don't know if Veritasium is a reliable source, but the recent video on Alan Turing made it seem like Alan had a good job and happy life for several years after WW2. Not defending that the UK government were pieces of shit, but I don't think it's accurate to say they turned on him "the second WW2 was over".
Edit: I checked another source. It was early 1952 that he was caught by the police in a homosexual relationship. So I guess he had around 6 happy years after the war.