Dionysius' desire for control and power is what causes him to be abusive, condemn Pythias, and provoke Damon's sacrifice.
Dionysius can't stand criticism and doesn't accept that anyone disobeys his orders, because that way he can control the whole society and have full power to do whatever he wants.
This behavior of Dionysius makes the plot tense and promotes the advancement of the story, especially when Pythias criticizes the way Dionysius acts and governs.
Dionysius saw this as an attempt to damage his domain and weaken it and so he condemns Pythias to death. This condemnation fuels the despair of Pythias' friend Damon, who is willing to fight for his friend's life and sacrifice himself if it allows Pythias to stay alive.
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