The Count of Monte Cristo: Why is this chapter a good example of dramatic irony?

The chapter illustrates how Dumas used historical events as a backdrop for his writing. We already know how the political situation of the revolution unfolds: the characters exist within this historical context hence the dramatic irony. Danglars takes advantage of the political situation in France to incriminate his nemesis. Napoleon is in exile and the royalists are in power, thus anyone accused of being in league with the former ruler is to be severely punished. Within this politically unstable system, all Danglars must do to dispose of Dantes is to accuse Dantes of being a Bonapartist agent.