Modern scholars have argued that tacitus used the germanic peoples to criticize aspects of his own roman culture. what evidence might support this point of view?

Tacitus ( AD 56 - 120 ) was a Roman historian. He described the Germanic tribes in his work:"The Germania" ( "De origine et situ Germanorum"). He criticized the degeneracy and immorality of Roman society. In this work the Germans symbolized an agrarian culture with martial virtues. He thought that the taint of foreign decadence led the Romans into moral decay. Tacitus used the Germanic peoples as a cultural mirror. 

Not sure if it’s within 12 months, but you could talk about the spreading of alt-right hate speech and whether that is covered by the right of freedom of speech? or, cover how during the midterm elections in some states many native american populations were declined to vote because they didn’t have the proper id, despite being citizens? also, the death of that journalist last month, who spoke freely and reported about the saudi government and how corrupted it is and was killed because of that (lack of free press/speech). just some ideas for this prompt, i hope at least one of them : )