They absolutely do not, unless you’re getting too many calories.
Individual foods are—with some exceptions—neither bad for you nor good for you. A healthy diet can occasionally include doughnuts, and milkshakes. Your overall diet is what matters.
Sure. We’re saying roughly the same thing. For most Americans, hamburgers cause heart disease because we don’t exercise enough or eat enough plants. If you’re backpacking twenty miles a day, sure, eat whatever, you won’t suffer inflammation or obesity from it. (Though you may run nutritional deficiencies. And you’re building bad habits for when your activity necessarily tapers off.)
Sure, they are not mercury-level toxic. However, these recommendations are for people who consume way too much of these dishes, and it's a safe assumption that this is the case for a significant part of the population.
Most green vegetables you can eat unlimited amount and stay healthy. They are absolutely "good" food. (Please don't reply with something trite like "oh, but what about the pesticide residues?") The same can be said for high fiber (soluable and insoluable) fruits like apples, oranges, and bananas. As long as eaten whole (minus skin for oranges and bananas), it is almost impossible to overeat these and they are absolutely "good" foods.