People of the present come from the people of the past. If society does terrible things to one person's grandparents and good things to another person's grandparents, one of those people is going to have more difficulties growing up. If this was condoned by society, perhaps society should take steps to fix it, otherwise the cycle may continue.
This only applies for segregated societies, though. I can see an argument for reparations to the grandchildren of slaves, for example, because their whole economic structure was impacted in a heritable way. The same doesn't apply across generations for women - if your mother was discriminated against, you suffer equally for it whether you're male or female.
Dude, if your mother was discriminated based on her gender, and you share that gender, you know that her story of discrimination (in the workplace, say) likely applies to you. If you're a man, you know that scare story doesn't apply to you.
