Originally Posted by
Endus
You are really underselling Daenerys' horrorshow.
She had no problem with her brother, at the time the rightful Targaryen heir, being "crowned" in molten gold by Drogo.
She burned all the Dothraki Khals, alive. Why? Because she wanted the Dothraki, and they said "no".
She locked Daxos in his vault to suffocate to death, for stealing from her.
She slaughtered the entire leadership of Astapor, for being slaveowners.
The bit about putting Meereen's slavers on racks in revenge for their doing the same to children is her stooping to their level, not a move for justice.
The one attempt she made at proper justice, rather than her personal whims of the moment, was a grotesque failure that pleased no one (killing Mossador, after he killed a Harpy's Son, for having himself killed an Unsullied). And it was the last time she made any pretense towards justice or any form of trial.
After all of this, she completely abandoned Essos. She has no consideration whatsoever for the political upheavals she created, nor any interest in ensuring a better system prevailed; she secured the resources and men she need, took them and left.
She burned the Tarlys alive, when they were her prisoners and had already been defeated on the field.
And before you say "but she went North to help Jon and the Starks", she protested that constantly, even when she knew the Night King was a real threat.
None of this is new, or surprising. It's the natural evolution of her entire character arc. She has always been solely interested in her own personal power and control. Hell, let's put it in her own words, from way back in Season 2; "I will take what is mine, with fire and blood I will take it." "When my dragons are grown, we will take back what was stolen from me, and destroy those who have wronged me. We will lay waste to armies, and burn cities to the ground."
She's always been a brutal tyrant with a vicious temper and no sense of mercy. This is not a recent shift, at all. She's exactly in line with where she was in Season 2.
Edit: Don't take the above as a defense for the silly bullshit that is Season 8. I'm just making the point that this one particular thing isn't out of left field; Dany's penchant for madness and violence was introduced before Khal Drogo even died, and has been continually reinforced since.