Why not just let free market decide? If he was such a valuable employee, then they're shooting themselves in the foot. Another company will hire him, and they'll be better off, and thus good actions are rewarded and bad ones punished.
Cause it doesn't work that way in practice. The company may well be hurt by the decision and unable to find as good an employee, but that driver is never getting another trucking job. It doesn't matter how good he is, when the other company finds out he was fired for having an alcohol problem they will throw away his resume every time. He can apply to as many places as he wants, but every time that application will end the moment they call his prior place of employment.
--
(Maniac64 at work) [Browncoat] ~Board 570901~
All the proteins, vitamins, and carbs of your grandma's best turkey dinner, plus 15% alcohol.