A clear conscience is generally the result of a faulty memory, not a faulty life.
Don't worry. You're safe now. You've got nothing left to steal.
Theres no such thing as a free lunch, at least on the karmic level.
Humans are upsetting a fragile balance that their own human ancestors established.
Humans may be the only creatures on Earth who spend significant time thinking about the fact that someday their lives will end.
Archaeology is the anthropology of the past, and science fiction is the anthropology of the future.