CP = Population of Canada
USP = Population of United States

( CP * 10 = USP )

Joy of Canada Win in Canada X CP X 10 > Sadness of US loss in USA X USP

and

Sorrow of Canadian loss X CP X 10 > Joy of US win in USA X USP

The total joy of a Canadian victory is more than 10 times greater than the sadness of a US loss (as there are 10 Americans for each Canadian), and vice versa.

IOW, a Canadian victory makes the world a happier place.