Please see this link for an official apology of Turing’s treatment.
In a sense it does seem pointless to apologise for something that one as an individual was not responsible for; what the apology symbolises is an acceptance of homosexuality, or more specifically, the intolerance of homophobia. I’ve many dear friends who have had a lot invested into this petition.
I think that the statement marks a real change in attitudes. Political correctness is a many sided object, but some faces are quite good.