On one hand I think you're right, on the other hand I think you're over looking something. Durant strikes me as incredibly insecure and he requires a lot of coddling/love. His emotions have gotten the better of him multiple times, including when he was using his twitter fingers to defend himself a couple years ago.
That being said...traditionally people like this get manipulated and hurt. People take advantage of them, and then trick them into staying in bad relationships by promising to love them, take care of them etc. I feel like the Warriors exploited this in order to get KD to play in game 6. I'm sure they presented a very emotional pitch to him on Sunday and promised all type of things that appeal to KD's sensibilities. The fact that KD decided to leave suggests that the manipulation didn't work...so I can't help but feel like he showed some growth here.
Will this continue? Who knows. But I respect him for this decision.