All her life, Daenerys was driven by purpose of sitting on iron throne— and Cersei — to keep the Lannister's hegemony over it.
Even during their lowest of lows, they believe they are irreplaceable.
When the Red Keep fell to Danaerys' dragons, Cersei was alone. When Daenerys chose to burn down King's Landing, she was alone.
They want to break the existing "wheel" of rules of the game of power.
Daenerys chose the extremes 'bend the knee' or 'die'. She didn't choose to negotiate even when she had a choice.
Daenerys Targaryen's faith monologue to Jon Snow reflected her faith in her destiny that she was meant to be on the Iron Throne.