5 movies you like/love that no one else does.

Having Luke be the way he is in Last Jedi is not out of the realm of possibility.  It's like how soldiers who have always behaved a certain way go to war and become hardened and/or changed from combat and have a personality change.  Something profound happened to Luke that made him end up a certain way and give him a change in personality.  In the end, it shows he's human like the rest of us.