There may be no “best” answer but there are certainly wrong proposition.

Same applies to culture and race, there may not be one best culture, one superior race or one perfect insititution, but there are certainly problematic ones.

Evolution of humanity will get stuck in a vicious cycle if people refuse to face the latter part in fear of offending some large groups of people (or barbarian). This is particularly important when humanity rebuilds after WWIII or have a chance to colonize another planet.