Price floors don’t offset the costs of regulatory compliance and long-term loss of profits for producers, and they disincentivize competitive market entry that would lower commodity prices for consumers in the long-term.
So, the perceived short-term advantages of price controls for both producers and domestic consumers of commodities make doing away with price controls politically costly.
This is the eternal conundrum of political economy: consistently solving for short-term benefit, over the long run, makes life worse for everyone.