In Sword Art Online people get trapped in an online virtual world and cannot log out or be logged out without dying. Of course the only way to get out is beat the game. The thing is it had a simple premise that could have said something meaningful but didn't say anything when the moment came, and went, in episode 14 (because the premise changes after episode 14). The premise could be considered trite alone if the anime was not continually conscious of the situation, developed the characters around it and wanted you to think it will end in a meaningful statement. To compare it would be like watching Naruto and Sasuke finally meet and they go...
"hey what's up"
"not much"
"coo"
"so later"
"k coo I am going to die now"
"alright coo"
In SAO it's not just there was no resolution but that your friends died, you've been morning them, blaming yourself, it's been a driving personality trait and it is THE entire series premise up to that point. You don't accept "I don't remember" as a reason as to why the antagonist imprisoned and killed 4000 thousand people in SAO! (Then to add insult to injury the protagonist gets a sister with a bro complex next episode, gag O' might XD.) Honestly I was on the verge of recommending SAO if it had actually said anything poignant. Even if it went the facepalm inducing "friendship" power route I could at least say it brought interesting questions up getting there. Here is basically what I wanted the antagonist to say explaining his actions...
"As long as I can remember I dreamed of a real world of fantasy and wonder but nothing I made was real. People would play a game to forget and then forget the game when done. They want to forget their worries, their cares, their weaknesses and run away. All of it goes back to wanting to forget one thing, death. So to have significance, to be more than a game, to be real it needed a real thing, death. Then people would cherish every moment in my world, then with people to save you could have real heroes, but, if that was all I never would have killed anyone. As I worked I realized a game without death would not make heroes but take them away from the real world. It's good to dream but when we spend all our time dreaming we can never build in reality. So I had another reason to add death to my dream world, to wake people up. To show them they cannot run from life forever. For a short time people will fear losing themselves in virtual worlds now, laws will be passed, restrictions will be made and they will be forced to live in the real world and make it a better place. Maybe they will even make it a little bit more like my dream."
So with that you take a simply premise, and a man who should otherwise be vilified, and make a poignant statement about doing something worthwhile with your life. Instead, while he waxes a tiny bit about a "dream", his answer to why he imprisoned everyone is "I don't remember".