Bruce Arthur: Dr. David Williams leaves a clear, tragic legacy as he rides off into the fog

You can say Dr. David Williams failed, and after that it's a matter of degrees. Being Ontario's chief medical officer of health in a once-in-a-lifetime pandemic was one of the hardest jobs possible, for many reasons. Existing systems were weak, the disease a challenge, the government a band of incompetents. David Williams didn't have it easy.