Yes but even if some ancestor of your committed a crime, what did you actually do to deserve being mistreated for generations? Your only crime is to _be_ part o

Yes but even if some ancestor of your committed a crime, what did you actually do to deserve being mistreated for generations? Your only crime is to _be_ part of that group, often in a way that you can't get away with. When it's skin color it's easy to see how you can't hide, but often people can't escape their group/caste even if they don't physically look particularly differently. Humans have a strong mechanisms to make sure every body knows the ingroups and the outgroups.