As far as being an sympathetic towards this luckless individual, that is easy and I am. He had no illegal intentions, he was doing a normal, routine business transaction and was nailed on a set of technicalities that he probably could not have complied with since the US Customs Post was already closed.
As far as Canada and their upset about this, they need to do a reality check! We are at war and our borders are our front-lines. The Al Quiada Millenium Bomb plot was stopped by a US Border Policewoman and not by anything done by Canadian authorities. As pointed out, we live in a different time and if the Canadians wish to retain our un-fortified border, they are going to have to accept our increased security concerns!
With the Visa Express scheme for your Saudi "friends", and considering that none of the 9/11 hijackers came from Canada but slipped through YOUR immigration policy, it should be us sealing the border.