These aren't "Random examples". Open a history book for once in your life for crying out loud. Read up on Julius Caesar, Cyrus the Great, Ataxerxes, Alexander, read up on Harald Hardraada, Harold 2, read any one of a thousand different monarchs behaviours in antiquity and then really, REALLY think about what you're saying. Are we going to find all their ancestors and "demand reparations"? Is that really a worthwhile use of our time? The perpetrators are dead and - AND - we can't apply our morality to ancient civilizations because that morality didn't even -exist- at that point. Slavery was legal hundreds of years ago.
Or if you want to be angry at something (because clearly you do need something to blame) then perhaps the people holding an estimated 8 million slaves in India could be a start?
https://m.timesofindia.com/india/does-india-have-8-million-slaves/amp_articleshow/90986262.cms
Or (back on topic in a roundabout way) we can hold up those perpetrating human rights abuses in Qatar or wherever else we find it to light.
We can't do anything about the past but we can absolutely hold people to account for what they're doing in the world today, instead of pretending it's all someone else's fault.