Black families used to eat greens such as collards and mustard cooked with bacon or salt pork and served with vinegar.
Those greens are actually a much more nutrient dense vegetable than is iceberg lettuce with some blue cheese or ranch dressing, cheese, bacon bits and croutons. A lot of kids do not like tomatoes or mushrooms so probably they do not add those at the salad bar.
But serving greens would probably be considered racist, even though all races could benefit from it.
I still love turnip greens, and yes, greens are very nutrient rich. Vegetables were a mainstay at our meals, not because our parents were particularly concerned with nutrition, but because we grew them ourselves and our parents were DEFINITELY budget-minded.
I'm meandering, but your point about vegetables =/= salad is valid.