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human
[Star Wars] Honestly, what anger was Yoda sensing in Luke?

In Empire, Yoda states that the anger in Luke is comparable to the anger in Anakin...in what way? Sure, Luke outright does genuinely hate Vader and seeks vengeance against him, that is very dark, but, even then, Luke isn't really like Anakin. Anakin at the height of his Jedi career during the Clone Wars was willing to *torture* when he got a tad bit pissed, whereas Luke doesn't seem to have such a capacity at his most enraged. For the most part, in both the EU and Canon, when Luke fights, he seldom does so with rage. He doesn't seem to be fighting with anger during the Cloud City duel, never does throughout the comics. In fact, the only individual Luke seemed to hate was Vader, and he let it go when he learned the truth. Luke honestly has a softer temperament than some Jedi we've seen, particularly Ahsoka, and she never willingly turned to the darkside. Long before Anakin became Vader, he had already slaughtered a Tusken village in rage, had no qualms about killing his enemies, and desired power (Luke wants to be a jedi, but not for the power, mostly just to be like his father at first). How are they comparable?
gpt
Luke was constantly frustrated by his simple, peaceful life on Tatooine and impatient to leave and fight in the Rebellion. The Empire killed his aunt, uncle, and best friend leaving him wanting vengeance (this and his father's legacy were his only motivations for becoming a Jedi, something Yoda takes early notice of).

Luke was also prone to drawing his lightsaber first and kept it with him when he entered the Cave of Evil (this is such a persistent flaw that he would later throw away the sword entirely after he drew it on Ben Solo). When Darth Vader threatened his friends he felt their pain through the Force and recklessly rushed away to save them. On the second Death Star, when Vader threatened Leia, Luke immediately attacked in a rage.

Above all, the trait Yoda most often ascribes Luke is his looking to the horizon, and never being content with where he was and what he was doing, always wanting more, like his father.

And Yoda considered Anakin a friend and didn't learn the full extent of his inner darkness until it was too late, he's naturally much more cautious with Luke.