Strategically, canada is a landing and staging ground for chinese troops, armor and fire support to invade from the north. Its why they have braindead people bleating about communism and degenerating the nation into poverty and lawlessness. A perfect milieu for foreign troops to come over and 'help' that have no intention of helping.

I dont think the US ought tolerate a failed state on any border, north or south. And if they need to remove causes of the failures in less than overt means, then so be it.