I really don't understand this urge to prosecute him. Why isn't this treated like an airplane accident, where only in extreme cases the pilots are prosecuted? Yes, the man may have made a mistake. Missed a sign, fumbled the controls, miscalculated something, whatever. For me the obvious response is then to find out why that happened. Was he blinded by the sun, were the controls illogical, was he not trained enough, etcetera?
Isn't that much more productive than immediately assuming that he should be thrown is jail, for whatever good that would do?