The end of the first Sicario movie is still one of the best reflections on the modern justice system. One of the main reasons for the existence of the justice system is providing victims and their relatives with a sense of justice (mostly in order to prevent vigilante justice). If the justice system fails to fulfill that main reason, the alternative becomes necessary. That's why the ending is so satisfying, even if children are being murdered. It should mandatory in law school. It could improve society.