Because of course, condemning someone for the misdeeds of an ancestor is unjust and silly.
That is not a really good understanding of how things work.
If your people ten generations ago scraped all the topsoil off of the fields where you need to raise corn right now , you will suffer for this bad choice that you were not consulted of.
If your people caught the last Stellar Sea Cow and ate it , you have no sea cows to eat now , nor even such a thing to look at.
If your generation spends every dime that the next three generations can earn , the generations that follow will have to bear this problem .
Suppose that a few of us contribute to Ducks Unlimited and therefore the ducks survive this present opportunity to become extinct, does it matter that there will still be ducks when all of our generation is dead?
If there were never an Adam And never an Eve we did have at some point some small number of ancestors, who chose not only to survive their hard times , they chose to thrive and grow and spread and explore and dominate the Earth.
They chose to exploit and learn and remember a heritage.
They chose to separate themselves from nature.
And we bear these consequences , good and bad.
Can you imagine an elegant allegory for this?