You have no idea what you're talking about. You ought to read about this before making such sweeping claims. The Dutch invaded islands, killed and tortured the locals into submission, razed the island and enslaved the women and children to work on spice plantations.
https://www.npr.org/sections/thesalt/2012/11/26/165657050/no...
> Current ancestors of those working classes are not responsible for their ancestors oppressors.
No one is arguing that. They're making the very reasonable claim that one group of people oppressed another and that this put the oppressed people at a significant disadvantage relative to those who benefited from the oppression, and thus that resources should be redistributed to balance that - a policy that makes perfect sense in terms of economic incentives.