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Dany burned the crap out of something every single season of the series. Her first instinct was always to burn something. She used ’honorable intentions' to justify her methods in her mind. even when the methods weren't always honorable. At some point burning people becomes de rigeur.
People held her back from it at every turn. To her credit, she did listen sometimes. Until she didn't. When she was held back or changed course from her first instinct,it often blew up in her face. Especially in westeros. She'd been betrayed in some form or fashion by a lot of people (Jon, Tyrion, varys,Jaime, jorah, cersei etc) I guess she had enough.
Throughout the series, I got the feel that she wanted to be good,to do good, but only if it didn't hinder her from taking the throne. People oftened questioned her character behind her back.
Westeros not being what she thought it was, and her no longer being the rightful heir (a problem compounded by the Jon denial) were probably her two biggest drivers in her full metamorphosis. The issue there is that the reveal occurred too late in the story.
The final 2 seasons should have been 10 episodes each and it could have been done more smoothly.