I think City of God must have inspired this movie. There are no children in this film, and it takes place in a fictional near future, but the presentation of the effects of violence on the characters achieves a similar gut-wrenching realism. The future merging of the issues of immigration and terrorism is the real center point – the apparent premise of a world gone sterile seems to me to be used as a device to craft a warning about the future of these other, current issues. This kind of movie can easily take the drama and violence too far to retain my suspension of disbelief, and it does, but just a little. Most of it is done extremely effectively.