We have the right to "pursue" happiness and success, but there is no guarantee or right for us to succeed. As an analogy, all students can participate in the national spelling bee, starting at the ground level. But nobody is entitled to win the final prize except the best speller. This is modeled on natural selection. The right to pursue implies there we can't fix various stages of the spelling bee so we get the winner we want via unnatural selection.
Evolution within a culture will not occur if we fix the deck leading to unnatural selection. Only natural can evolve. Unnatural works only in the short term, which is long enough for needs of politicians with self lives.
Why not entitle the National Spelling Bee in an artificial way? This would make many "feel" better. The long term health of the spelling bee would suffer since the alpha dogs would not bother to show up. If this were deer or animals, the species would regress.