Canada has plenty, Mexico and the American southwest do not.
Briefly stated, the ecomonies of the United States and Mexico will wither and die without additional supplies of water and the only realistic source of that water is Canada. Furthermore, Canada's ecomony is utterly and completely dependant on the success or failure of the econonies of its neighbours and it is in Canada's best interests to do whatever is reasonably possible to insure that success and this includes massive diversions of fresh water to the American southwest and Mexico.
It is also consistent with the Golden Rule - the Supreme Law governing relations among friends and neighbours.
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