It sounds like you make excuses for characters you like and then history should matter but it shouldn't matter if it is someone you don't. Whether she was out of control or not that was still Jean in mind and as such she is a murderer. There is no two ways about it. I'm sure the families of those murdered don't care any more about her being under the influence than you do the retcons for Emma's past. Especially given the entire situation with Jean was a retcon and as such it was Jean herself that commited the genocide.