There are no fillmmakers like Christopher Nolan. He is arguably the boldest filmmaker working today because where so many movies believe in the Idiot Plot (as Ebert was found of calling it) Nolan respects his audience that he thinks that if he gives just enough string they can follow him through labyrithine stories. That he does so with some greatest visuals imaginable is part of his appaeal; that he never sacrifices story or character in any of them is a larger part.
This is part of so many of Nolan's films. Memento is about a man who believes his love for his wife drives his actions, even though he can't remember the. The Dark Knight films are superior to all comic book movies because Bruce Wayne is at the center not Batman, and we see a man who is driven to things out of love - for his city and the memory of his parents. I prefer Rises as it end because it shows him as a man who has found enough peace that he can give it up. The Prestige is a story that is about two magicians who are driven by the love for perfection of their craft and their devotion to other people - Jackman's character does everything out of the loss of his wife, Bale for the love of his daughter. Inception is a hig-wire act where Cobb does everything he does out of the love for his wife.
And Interstellar is the most complicated of all of them but it has the greatest soul of all of Nolan's films. I do see the argument you make for Cooper being selfish - even at the end of the film when he's aaved the human race, there's a part of him that can't be happy with it and still is moving forward. Murph is the hero of the picture because she believes in love even when it isn't returned - even with the planet being doomed she still wants to save her stubborn brother who has been just as stunted by their father's leaving as she has but can't move on. Murph doesn't give up on the mission after the betrayals of both her father and of Dr. Brand. She's the savior of mankind and she probably is deserving of the legacy that her father never gets. She probably understands at the end why her ather has to leave her again - the world he knew is gone forever and he can't watch his daughter die. It makes me cry in the final moments in a way frew ow Nolan's films, however brilliant thye are, rarely do. There's nothing nolan can't do. He can break your brain and he can break your heart. mANY FILM MAKERS can do one but not the other. Nolan is one of the few who can do both.