This story is an embarassment - http://www.cbc.ca/news/canada/british-columbia/story/2013/02/03/bc-super...
Even if it weren't from 1981 (over thirty years ago), this should have been a matter solely between him and his own government, and barring him from the US is a punishment far exceeding what is deserved for the crime.
There should be a general reform of the criteria for refusing entry to the US.