Can you provide references to the subsidies you mention? I think you will find that this is a common misconception with only some truth to it. I hear often that US agriculture is subsidized, but never hear specifics. I'm genuinely curious where people get this impression.

The majority of ag subsidies are not given to farmers for growing things. Crop insurance is subsidized, but that doesn't necessarily lead to overproduction as is only really kicks in when conditions are very poor. Conservation programs (to NOT farm land) are also subsidized. This again doesn't encourage over production.

There are many things that could be improved in modern agriculture, but my view is that subsidies have little to do with our largest problems.