You know, if I was Leia, I’d be really pissed at Luke. He trains her son and he turns to the darkside. Of course mistakes happen and Kylo Ren is partly to blame himself, as is the new Emperor. I can understand Luke being angry with himself and blaming himself for what happened and never wanting to train another Jedi again. But Kylo Ren is on the loose and perhaps or perhaps not Luke also knew of the existence of the new Emperor. The only known fully trained Jedi is Luke, and he leaves??? He doesn’t think “well okay I’m never going to train another Jedi, but maybe I ought to stop Kylo Ren and then leave”?
What about Obi-Wan and Yoda just kind of hiding out and doing nothing for all those years? Not training up Luke or Leia, or any Jedi at all for that matter, just hanging out and watching from a distance. Surely they could have trained up a whole army of Jedi and went at it with Vader and the Emperor, or at least made another attempt to stop them themselves? If two of the most beloved characters of the OT get a pass when they did the same thing more or less why shouldn’t Luke. I’m sure he has his reasons, just like Obi-Wan and Yoda did.