Puty said:
Yeah, but when he was seeking power he still refused to kill Naruto to obatin new sharingan, after their first battle in that valley.
At that time, he refused to kill him because he didn't want to get the mangekyou sharingan the same way itachi did (by killing his best friend), he wanted to trail his own path.
Now, he just wants to dissolve all bonds, so he can carry the hatred of the full world