Corporate tyranny can infect a government, but democratic governments can be changed. However, like replacing a rotten crop, it takes a while to grow a truly new generation of politicians.
Choice is built into the democratic system, while monopoly is the logical goal of corporations. Democracy tries to rely on cooperation while individualistic corporations compete to be biggest and devour their smaller, but more creative rivals. They continue this bullying behaviour by flooding politics with their only true resource, money, in order to further free them of responsibility and increase their ability to gamble and make bad decisions that enrich them and impoverish nations. And now the gamblers in the commodity markets are inflating the price of food higher than the drought damage justifies at this time. Deregulation continues to inflict its misery.
And then the corporations have the nerve to complain that the governments trying to clean up the mess, aren't doing it fast enough so the corporations can profit off it.