Luke's temptation to kill Ben Solo is fully legit and in line with the OT
A lot of TLJ detractors find this to be at fault with Luke's character, or that no way he would even think of killing Ben etc. However, this kind of thing is EXACTLY what he was supposed to do. In ROTJ, Ben clearly expects Luke to kill his father Vader, otherwise "the Emperor has already won." And Yoda talks of the need to "confront" Vader, which also includes the possibility of Vader disposal. In ROTJ the main conflict is within Luke who has this clear cut Jedi mission to fulfill, meaning to kill Vader, so as to prevent Dark Side from winning over, but also wants to save his own father. As he opts for the latter, he escapes the trap that the Emperor tried to lure him in by letting him murder his own father. So in the end, the Jedi were revealed to have been mistaken, the Emperor's plan was foiled, and the hero with his big heart won the day. And TLJ also aptly delves into this matter - i.e., whether Jedi orthodoxy creates more harm than good - but that's not something TLJ haters would understand anyhow. But to go back to the main point, yeah, there should be no issue about Luke's temptation to kill Ben. And then his big heart kicks in again and you have this same ROTJ dilemma summarized in a brief flashback sequence brewing in him and again he resists the temptation.
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