I’ve always found describing Luke as ‘trying to kill Ben’ to be a misrepresentation. Luke tried to kill Vader in ROTJ after being goaded into it, and backed down shortly after. Luke merely considered killing Ben in TLJ, after experiencing a harrowing vision of the destruction the boy would cause, and only for a moment before coming to his senses. These instances seem pretty consistent to me, the latter event being a more extreme but logical extension of the struggle Luke (and jedi generally) had to face. If Luke had actually tried to kill Ben, then Ben would be dead.

OWK puts Ben in similar positions but I’m not sure it knows exactly what to do with him. At the opening of the show, Ben himself is weary and has allowed his abilities to diminish, which is understandable emotionally yet at the same time seems dedicated to protect and train Luke at the earlist convenience. These seem highly contradictory. Once Ben has gotten his groove back, he’s able to defeat Vader and accept Anakin is gone, but will still not put him out of his misery, and is no longer concerned with Luke’s training. Probably a symptom of finding an arc between III and IV when there didn’t need to be one.