Simaril, you want to know how? Just look to the western US in the 19th century. Without recourse to Law, the settlers there made their own. And they enforced it with guns. They held it until Law could be established, and then they gave over its care to appointed and elected officials.
Point being, when there is no recourse to a higher authority to take care of you and enforce the "rules" that makes society tick, people of good conscience must be able to step in and take up the slack in the reins. Thats what the 2nd amendment to the constitution is all about. Its not just about a militia to be called up in times of war. Its about times like this when there IS NO GOVT. within easy reach, and men rule by force. Freedom is never free. Someone will always have to be willing to stand between the wolf at the door and those who cannot defend themselves. Usually its the police, or the National Guard, or sometimes the Army. Someday, the only one left might be your neighbor.
Soon, order will be restored, those who want to leave will be evacuated, and this will end. Until then, my prayers are with every soul in that toxic dump of a swamp, especially the ones who stayed because they couldnt leave someone else.