I Am Immortal: OP's explanation really subverted my understanding. I really didn't read up this part of history in detail, so I always felt that Mu Qing had evil in her bones and was a born sinner. However, after reading your explanation, I realized that there was a reason for her action. At the bottom of it all, it was Feng Qi who harmed Mu Qing. Sigh.
I Yearn for Victory: After reading that diary, I suddenly felt that Mu Qing was not as evil as described in history. She also had a soft side in her heart. However, she chose to show this side to Feng Qi, this dog, but showed her evil side to the world.
Just as the OP had said, if not for Feng Qi, she could have been evaluated as the current and the historical God of Combat. In the future, she would have been honored and her name recorded in history, becoming a great figure praised by many generations.