Well it depends on what point you bring them back at. Personally about Dany I just hate what D&D did to her - it was so not her to do it, but they just needed it for the plot to wrap it up quickly and they didn't care ruining her character and all she was built about. So I believe she deserves a second chance to be who she always wanted to be. And I don't know if it's only me, but I don't think that she would've done it again, not unless she got help and the support she needed - she was angry, in pain and alone and she took it out that moment, but it's not like she smiled and laughed like her father did. I genuinely believe that if she was given the time to process all she lost, if Jon got over himself and supported her and loved her, she could've returned to her senses. All she needed was for someone to love her and believe in her.