I feel like this attitude is part of why nutrition science is the way it is.

People are boxed into this "healthiness is a one-dimensional scale" thinking. Are eggs healthy or not healthy? Are potatoes healthy or not healthy? Is pizza healthy or not healthy?

But reality is way more complex and nutrition science knows very little about "healthiness" (to the extent that you can distill diet into a one-dimensional scale). Scientists only claim, "X is maybe correlated with Y (in Z population)".

So this simplification, plus the lack of definitive known truth, leads people to latch onto B.S. like "eating eggs is unhealthy because eggs have cholesterol".