Just to be clear, subjecting someone of lesser brilliance (99.9999999% of the population) to Turing's treatment would be equally immoral. Seriously destabilizing a suicidal person is murder and on a moral level I don't believe in claiming that a particular murder is more or less immoral than another. Murder is murder and I don't think you can compare magnitudes. So if he had been an ordinary guy, his murder would still have been wrong on a moral level. I'm simply arguing that in addition to the usual costs of murder (felt in large part by the deceased family), society has borne an additional cost.