Evolution REQUIRES that some of the species is "better" than the rest of the species. Not all of us can be successful, no matter how much you wish.
I think you're misinterpreting Darwin's ideas just a little. Evolution only requires that there be
variation within a population. "Better" is a subjective term, and is dependent on those practically random (in the original Darwinian view) phenomena that determine the "survival of the fittest." Sidetrack example: White moths might be "better" at flying than black moths, but when the forest gets covered in soot, the black moths will survive.
More pertinently (and not to defend the "liberal" point of view), human success is not predicated on the relative merit of one's genes. (Yes, humans have some qualities that other animals don't. Get over it, anthropocentrism freaks.) The fact that you and I can engage in intellectual discussion, while we come from very different segments of the population, helps to show that environment (as Darwin would have said) plays a major role in shaping how your phenotypes express themselves.
If you take a look at "successful" people - those
you define as successful included - you will note that they come from a wide variety of backgrounds. The conclusion that genetics plays a major factor, when drawn from empirical data, is shoddy at best and erroneous at worst.
Moreover, I think modern educational systems as a whole have tended to explode the idea that the academic (or otherwise) merit of students is rooted in who their parents were, or a point mutation on chromosome 17.
Is everyone equal? Let's rephrase that. Everyone, excepting persons who have their learning/physical capacities severely limited, has the potential to attain "success." However, it is their environment (including economic conditions, life at home, school, etc.) coupled with,
but not limited to, the exertions of the individuals themselves, that brings "success" to fruition.
You'd be surprised at the numbers of "liberals" that are adopting this basically Social-Darwinist point of view. No offense to you, but it seems like a cop-out for researching and understanding that the majority of folks living in Watts* aren't there because they are retarded, unfit, or like it there.
*replace with your ghetto of choice