It's like talking to smokers who don't believe they put stuff in cigarettes.
There's definitely evidence for harmful chemicals being in cigarettes. Plenty. Wanna know why I agree? Because actual, legit studies were done. What studies have been done specifically on Popeye's Chicken Sandwiches? (The answer is none, because you're talking out of your ass.)
There's no evidence of Popeye's, again, putting "stuff in the chicken" to make people "act crazy". You have yet to provide any, you just start talking about additives in other foods.