All this is unauthenticated, and I shall leave it open. - Tacitus

He had not even adopted Tiberius as his successor out of affection or any regard to the State, but, having thoroughly seen his arrogant and savage temper, he had sought glory for himself by a contrast of extreme wickedness.

Ne Tiberium quidem caritate aut rei publicae cura successorem adscitum, sed quoniam adrogantiam saevitiamque eius introspexerit, comparatione deterrima sibi gloriam quaesivisse.

Because they didn't know better, they called it "civilization," when it was part of their slavery.