why wouldn't anyone uphold them? while many police officers are corrupted, I believe there still plenty that would continue to do the job in-spite of low or no pay. ever hear of vigilante justice? some people seem to really really want us to turn to a mad max fist of the north star type of world, but I just can't see that realistically happening on a global scale.
even some of the most fucked up places in africa still have some form of law enforcement, as shitty and corrupt as it may be. people will always try to establish order and leadership, it's only natural, you see it everywhere from super power nations, small tribes in the far off jungles, and even street gangs, they've leadership and rules they abide by in their group. even religions have their ways of enforcing rules, used to be the church had it's own form of police that kept order.
The only people that will turn to this >>17007 will be outcasts of society who struggle to survive as bandits while everyone else rebuilds society. in case you didn't notice, even in mad max and fist of the north star, there were plenty of examples of people building communities with clear signs of order, defending themselves from bandets who also had their own system of doing things within their community. max and ken both relied heavily on other people to survive and gather supply's. very few people can get by on their own. humans will naturally try to work together, which will inevitably form communities, which results in rules and laws.