Well, it is theoretically sound, but realistically, it is difficult to identify a 'good man', particularly one who uses underhanded methods for good ends, while at the same time, identifying the outcome of a given action can be chancy at best, with the actual end reflecting the interplay of many uncontrolled forces, some actively acting to manipulate consequences.
Now, if there was some way of identifying a person suitable to be trusted without having to rely on his actions...and for said person to reliably judge the potential outcomes, short and long term, of his decisions...