They can tell that they were civil, not barbaric in the least
A society at peace. With liberty and justice for all

from Lupe Fiasco (Ft. Jason Evigian) – Unforgivable Youth Lyrics on Rap Genius

Meaning

People of the future would look at the past and think that the society was perfect. The irony of these lines is this future observer doesn’t know about the level of violence and barbarity in society.

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