It's not just bad storytelling—it’s because the storytelling style changed from sociological to psychological [...] But if we can better understand how and why characters make their choices, we can also think about how to structure our world that encourages better choices for everyone. The alternative is an often futile appeal to the better angels of our nature. It’s not that they don’t exist, but they exist along with baser and lesser motives. The question isn’t to identify the few angels but to make it easier for everyone to make the choices that, collectively, would lead us all to a better place.

A plot walkthrough and an analysis of what the movie means. Good.

"We had an idea. Go to a place. Ask fifty people the same question. Film their responses."

Just like it says.

A blog of a professor of mine from Kansai Gaidai University. This post is particularly useful and enlightening.