Oh really? Who ultimately pays for the increase in steel to the auto industry? You think that Ford just absorbs the added cost to their product as a good will gesture to their customers?
Imposing tariffs on raw materials without having any tariffs on finished products makes the U.S. manufacturer less competitive in a global market. Ford is a perfect example. Imposing a tariff on Canadian steel gives the company a big incentive to avoid the tariff by simply producing cars in Canada instead of the U.S. The raw steel has a tariff on it, while the steel in the car does not.