Nick initially wanted to kill Adalind but Rosalee told him Hank would die if he did. He had the opportunity after he took her powers in the park but she was completely defenseless at that point and was no longer a Hexenbiest.
None of the main characters, although Adalind became one later in the series, died (or stayed dead) throughout the show. He had plenty of reasons to kill Adalind, Renard, and Juliette. There were points in the series where I wouldn't have blamed him much for killing any of them. All three are responsible for the murders or attempted murders of the two most important woman in his life.
I think there has to be some middle ground. It's extreme to say Nick is a hypocrite because he either doesn't spare or murder every bad wesen he comes across.
As for characters staying dead, that's going to open up a whole other can of worms. It's fine if you wanted Adalind to stay dead but Renard actually did die and Juliette was closer to death than Adalind ever was before the finale. Those were even more egregious than Adalind returning in the finale since everyone else did. In fact, Juliette died and Renard died again before Adalind did in the finale.
None of the main characters, although Adalind became one later in the series, died (or stayed dead) throughout the show. He had plenty of reasons to kill Adalind, Renard, and Juliette. There were points in the series where I wouldn't have blamed him much for killing any of them. All three are responsible for the murders or attempted murders of the two most important woman in his life.
I think there has to be some middle ground. It's extreme to say Nick is a hypocrite because he either doesn't spare or murder every bad wesen he comes across.
As for characters staying dead, that's going to open up a whole other can of worms. It's fine if you wanted Adalind to stay dead but Renard actually did die and Juliette was closer to death than Adalind ever was before the finale. Those were even more egregious than Adalind returning in the finale since everyone else did. In fact, Juliette died and Renard died again before Adalind did in the finale.