So why would any escapee from a US Prison think that Canada would provide safe haven? Admittedly, there are lots of mountains and woods and frozen tundra to hide out in. And if the prison happens to be close to the border, maybe it would seem like a destination. But, especially since Canadians can read headlines too (it is said), they will be on the lookout and would send you right back.
If the alternative is Mexico where 6' gringos standout (literally) in a crowd, that might give one pause. But at least you would be heading in the right direction to a port where getting on a boat to Africa, Asia, or the Middle East might be a little easier.