And yet they were changing the system, which he blatantly ignored in favor of what he wanted. He was stupid and naive to blame everything of the Kages, as the system was garbage long before their time. They were making an attempt to change the world for the better, but Sasuke threw a hissy for because it wasn't his way. The reasons Sasuke wanted to kill Naruto don't make up for the wrongness of the act. Sasuke didn't train for anything involving his eyes once he got the MS, he just knew how to do things, which is horse crap. At least when Naruto used Kurama down the line, he did it in tandem with Kurama, thus Kurama was guiding him along.
The two other times were in jest? So when he followed up on one of those times by putting her through a brutal genjutsu, it was in jest? So because Itachi put him in a genjutsu and tortured him, it's ok for him to levy the same on someone else? Are you really justifying that? As for him defending from her, he tried to murder her first, when she hesitated in killing Karin. She only attacked him later, when Naruto went to save her. In no way does that excuse him trying to kill her.
Furthermore, saying that there was nothing she could do is the same as calling her useless. The effect was the same, as her face suggests. Not to mention that he followed it up by saying that her and Kakashi would be dead/in IT had they not been standing next to Naruto. And then he didn't even bat an eye when they were about to fall in lava, because they were no use to him
Talking about this makes me feel like that sig of yours.