I think maybe we were all watching different films. So....
A new hope - luke aspires to join the rebellion to fight the evil empire. Risks his life to save a princess, then risks it again to destroy the death star. He's a bit stroppy because he's young and bored.
Empire - luke fights the evil empire on hoth, trains to be a jedi, but must leave to save his friends....risks his life for them......chooses potential death rather than join his evil father.
Jedi - luke risks his life to save his friend from Jabba, tells yoda he can't murder his father, tells his sister he can save their father, risks his life to do so, chooses almost certain death rather than join the emperor.
Last jedi - luke has trained some young aspiring jedi.....has a sense of something bad in his nephew....decides to go and kill him in his sleep. Abandons all of his friends and hides from the baddies.
We know of no terrible trauma that he's had over the decades that should somehow push luke to this incredible about face on all of his beliefs and convictions......he's just a bit of a coward and a weasle now because he's older.....and he had a dodgy feeling about something that hadn't happened.....despite him knowing jedi visions are entirely unreliable.
Seriously? Help me out with where that was plausible character progression. He's fundamentally changed his entire belief system and motivations for absolutely no good reason. Why has he lost everything that made him Luke?.
A new hope - luke aspires to join the rebellion to fight the evil empire. Risks his life to save a princess, then risks it again to destroy the death star. He's a bit stroppy because he's young and bored.
Empire - luke fights the evil empire on hoth, trains to be a jedi, but must leave to save his friends....risks his life for them......chooses potential death rather than join his evil father.
Jedi - luke risks his life to save his friend from Jabba, tells yoda he can't murder his father, tells his sister he can save their father, risks his life to do so, chooses almost certain death rather than join the emperor.
Last jedi - luke has trained some young aspiring jedi.....has a sense of something bad in his nephew....decides to go and kill him in his sleep. Abandons all of his friends and hides from the baddies.
We know of no terrible trauma that he's had over the decades that should somehow push luke to this incredible about face on all of his beliefs and convictions......he's just a bit of a coward and a weasle now because he's older.....and he had a dodgy feeling about something that hadn't happened.....despite him knowing jedi visions are entirely unreliable.
Seriously? Help me out with where that was plausible character progression. He's fundamentally changed his entire belief system and motivations for absolutely no good reason. Why has he lost everything that made him Luke?.
