Why oh why?

In this time where obesity is running rampant through the American society, why oh why are fast food companies still pushing these ridiculously unhealthy foods?! McDonald’s and KFC are constantly in competition with one another and it seems the stiffer the competition the more unhealthy the food! McDonald’s angus burger has 750 calories, 39 grams of fat, and 1700mg of sodium! They also have a mushroom version and a bacon version, but as with all fast food the more condiments, the higher the fat and calories