Adalind and Juliette have done very reprehensible things and both their relationships with Nick are highly toxic but I think there's an obvious reason as to why the reactions to them aren't the same.
The key difference is Juliette was on Team Grimm and Adalind was not. That's really all there is to it.
I think had Adalind not gone to Nick for protection and burned his trailer down or killed Kelly herself she would be hated but still not as much as Juliette. Adalind was the enemy so that's expected of her but Juliette was Nick's longtime girlfriend and friend to the scoobies. There was never any way she and Adalind were going to get the same response. Adalind burning down the trailer would have happened had she located it and not because Nick told her where it is. Kelly dying as a result of Adalind being involved in the setup wouldn't have happened because Kelly trusted her and let her guard down. The results would've been the same but the context would be different and that matters. I'd like to believe that this would've been too far even for the writers of Grimm to allow a Nick/Adalind romance but I have my doubts.
I know there will be some that argue about the validity of Juliette's relationships with the scoobies but I really believe this is why Adalind and Juliette are not viewed the same. It's the specific relations they both have to the gang that influence opinions about both.
The key difference is Juliette was on Team Grimm and Adalind was not. That's really all there is to it.
I think had Adalind not gone to Nick for protection and burned his trailer down or killed Kelly herself she would be hated but still not as much as Juliette. Adalind was the enemy so that's expected of her but Juliette was Nick's longtime girlfriend and friend to the scoobies. There was never any way she and Adalind were going to get the same response. Adalind burning down the trailer would have happened had she located it and not because Nick told her where it is. Kelly dying as a result of Adalind being involved in the setup wouldn't have happened because Kelly trusted her and let her guard down. The results would've been the same but the context would be different and that matters. I'd like to believe that this would've been too far even for the writers of Grimm to allow a Nick/Adalind romance but I have my doubts.
I know there will be some that argue about the validity of Juliette's relationships with the scoobies but I really believe this is why Adalind and Juliette are not viewed the same. It's the specific relations they both have to the gang that influence opinions about both.