Pure chlorine gas cannot remain such in the atmosphere. I suppose one day we may learn that it can, but current science says otherwise. Why? It binds with other things to become something else. It is not inert. Neither is the state of Anarchy. It is motherfucking, goddamn, son-of-a-bitching IMPOSSIBLE.
You know government refuses to stay in control because we are in society with people who do not take personal responsibility and are not honoring the unspoken societal truce. Government is simply the inevitable offspring of society.
When the mutual agreements of society have been ignored or breached, no one is obligated to remain peaceful and no set of rules apply. Humans have no obligation to respect the life or liberty of anyone else. They are not governed by any moral code or system of ethics. Their only code is to do whatever is necessary to eat and fuck, including ruthlessly killing other humans. Just like animals are under no obligation to each other.
To avoid the animal kingdom state of affairs, and maintain the societal truce, everyone must work to respect the liberty of others to pursue fucking and eating (happiness). Too many people have too many opinions and methods of exercising liberty. There must be decision makers. Enter--Government.
You cannot avoid it. Stop being naive. You can only hope to work with others to suppress it or replace it.
Keeping government in control takes diligence and persistence of the governed. Unfortunately, stupid and/or lazy people are allowed to breed, so this will be a never-ending chore. Because of that truth, at some point, I may actually consider supporting eugenics.