With their subsidies and overproduction, if they flood our market with dairy products and starve out our farmers, we might risk losing our dairy industry.  Who's to say that they won't raise prices after decimating our industry?

It is not wise for a country to lose their local food production capacities and be completely reliant upon exports from other countries.  We are better off to ensure that Canada is able to maintain some food security for the future.  Especially in such crazy volatile times that is expected in the future, whether from climate change or political upheavals around the world.