And if he had, the Force would never be balanced. Anakin was the only one who could stop the Sith. Though he lost faith in it, Obi-wan knew he had a purpose greater than fighting Anakin again. That's where Luke and Leia come in. They would be the ones to succeed where they failed. They took a page out of the Sith playbook by hiding and waiting for the time to be right. Actually, Luke does know what it means. He has knowledge of the Force. He knows that the Jedi protected the civilian populace for a thousand generations. That they were diplomats. Anything else he can make up on his own, just as the first Jedi did twenty five thousand years ago. Fortunately, she wasn't found out until shortly before his death. So it doesn't matter. They are logical reasons. They went into hiding. They failed. Now they must wait, train and prepare themselves to train the next generation. The same way Darth Bane went into hiding and had the Sith remain in hiding for a thousand years. Bail realized it was safe by the time she began working with him as a Senator. By that point, they were able to do what they did and Vader and Sidious had no clue as to who she was. And as I said, she needed to be raised as a normal person and not as a Jedi. Same with Luke. This was adapting from the previous methods of training, which made them both stronger people in the end. Sidious and Vader both felt a disturbance in the Force when Luke arrived on Dagobah. Vader himself became obsessed with finding Luke once he felt him use the Force at Yavin 4, and did everything he could to capture the boy and turn him. The Jedi themselves were hiding as well, because they were fugitives from the Empire. Yoda's body wasn't found in the Senate building and Obi-wan was seen walking away from Anakin on Mustafar. They, like most of the surviving Jedi, went into hiding. The few that made it past then, never returned to being Jedi. It doesn't matter because Luke wasn't at the farm. But Shmi did know the Lars. She fell in love with Cliegg and married him, after he freed her. Owen and Beru welcomed her with open arms. They were a family. And Anakin trusted them because they took care of her for five years and they took care of Padme while he was gone overnight. Ergo, the Lars were family. Being close to one family over the other isn't a requirement. You just don't get and you never will, because you don't know what it is like to walk a mile in those shoes. You really don't. Protection was only part of it. Family upbringing was the key. Love was the answer to the darkness. Unconditional love that came from Owen and Beru who taught it to Luke and in turn, he used it to save his father. No, because as Leia says to Luke, she doesn't understand the Force because she was unaware of her potential. She admired Luke in that he was doing what his father and his mentor had done years before. Now that the Sith were gone, Luke could teach her the ways of the Force and she would be his student without anger and resentment towards him. Why would that matter? Luke was never jealous of Leia's upbringing as a princess on Alderaan. He already knew she was adopted before learning about why she was. They had become good friends because she didn't act like a spoiled princess and she didn't look down upon him. They fought for a common cause which united them.