The FDA could easily ban unnecessary ingredients like partially hydrogenated vegetable oil, mycoprotein, Red 3, and BHA. And it could set safe conditions of use on substances like sugar and salt. But the FDA has done nothing about, or has even defended, each of those unsavory substances.
The bottom line is that FDA officials just don't act as if they are the protectors of health that the public expects them to be. Instead, time and time again, they have shoved problems under the carpet, perhaps hoping the problems will be forgotten or solved through voluntary action.