This is perhaps one of Shakespeare's more interesting plays, if you will. In comparison to Macbeth it isn't quite the walk in the park.
I think conceptually it enables the reader to see that characters can influence characters to such a degree that the original traits are masked and changed. Tragedy in this play is definitely a main component - and a great emphasis that perhaps the villain doesn't always find their true defeat. In a way, wasn't the "villain" successful? He lied to everyone and pretty much killed whomever got in his way.
The story of Moshe the Beadle, with which Night opens, is perhaps the most painful example of the Jews’ refusal to believe the depth of Nazi evil. It is also a cautionary tale about the danger of refusing to heed firsthand testimony, a tale that explains the urgency behind Wiesel’s own account. Moshe, who escapes from a Nazi massacre and returns to Sighet to warn the villagers of the truth about the deportations, is treated as a madman. What is crucial for Wiesel is that his own testimony, as a survivor of the Holocaust, not be ignored. Moshe’s example in this section is a reminder that the cost of ignoring witnesses to evil is a recurrence of that evil.