Would you be in favor of forcing a farmer in Iowa to sell corn in the US for $3 a bushel that he could sell on the world market for $5?
Sadly, I think it generally works the other way with the farmers.
In the case of sugar, I believe that you are being forced to buy sugar produced by American farmers, and are not allowed to buy sugar produced by foreigners.
This situation has led to many candy companies moving production to Canada or Mexico. The companies are allowed to import finished candy, but are not allowed to import the sugar to make the candy.