Sure, farming is risky, but not exceptionally so. Resort properties depend on good weather to make money and no serious person would suggest that we need a federal program to protect them from extreme weather. Further, farmers can use options to hedge their risk.
The survival of farm subsidies is emblematic of a larger problem: Government is biased toward the past. Old programs, tax breaks and regulatory practices develop strong constituencies and mindsets that frustrate change, even when earlier justifications for their existence have been overtaken by events.