Any culture has pros and cons. You’re acting like the only positive culture history has seen has been “white” culture (which is kinda racist in and of itself). Of course people build cultures to achieve positive social outcomes!!! That’s life, meng.
What you’re explaining does not justify reparations and conveyance of generational guilt. Look at the comment I responded to. I asked whether I deserve scorn. You’re arguing that I deserve scorn and somehow need forgiveness literally for being white.
The micro fluctuations in cultural benefits you’re describing isn't tangible in any way. You’ll just be shouting into the void forever trying to equalize every culture so that no differences remain. And you’ll hate a lot of people from different cultures along the way. And guess what: our law already treats people equally, we’ve already achieved legal equality.
Finally, logically, it simply doesn't follow: culture (a) at one point in history did something we now consider wrong. Culture (a) listened and changed. Culture (a) removed the bad parts and kept the good parts. Therefore the remaining good parts must be bad and culture (a) must be dismantled and destroyed and anybody who participated in it and shares its majority skin color shall be scorned and etc.
It’s just stupid.