Gizmodo ran a piece recently titled What Happens When Cities Fall Apart? about the work of David Kilcullen, an Australian military theorist who believes that many future conflicts will take place in lawless urban areas—what he calls "feral cities". For me, this was the most important, and most saddening, passage in the article:

...if cities—particularly in the world's coastal, developing regions—are such a hotbed for future aggression...then how can we develop a new understanding of the city that would help us away this growing problem? How can both civil infrastructure and urban governance be made more resilient to become defenses against collapse?

Personally, I think the real solution is to prevent collapse in the first place by engineering a more equitable society—one in which people feel they are respected, have a stake, and are able to succeed. But as Anu Partanen pointed out two years ago when discussing what Americans don't want to hear about the success of the Finnish school system, this depends on us being open to talking about meaningful social change.