futures contracts work somewhat well for farmers. There's a level of certainty provided and they are reducing their risk so that a low price at the end of the season doesn't ruin them (however they also don't profit from a higher price). As a farmer i would likely prefer to sell a certain percentage of my goods with a futures contract so that i can have less risk of financial ruin.

The relationship between futures traders and farmers is pretty much identical to that between any kind of insurance company and its customers - it's a risk arbitrage transaction where the client (farmers in this case) are sacrificing profit in expectation for a flatter outcome curve which in a properly priced market yields higher utility in expectation, since utility as a function of profit is concave for an individual farmer and much closer to linear for a well-capitalized market maker.

I understand the mathematics. The problem is that there is a practical asymmetry of information. Large future traders can invest a lot of resources into getting a much better prediction of future prices, while individual farmers cannot. In such scenarios, it is inevitable that farmers will be exploited by future traders into making bad deals.

You might try examining -- with an open mindset -- a few CFTC Commitments of Traders reports and then see if you feel the same way.

This reasoning seems suspicious. Why would farmers choose to use futures markets if it doesn't benefit them?