My understanding is that anarchy isn’t about the lack of any authority, it’s the lack of unearned authority or unearned authoritative hierarchy. If the members of a community choose to use a democratic process to elect individuals to hold some specific authority for an amount of time that doesn’t stop being anarchy. It stops being anarchy when individuals capture or hold authority not granted by a dictate from the community. There are some issues with how a species like humanity could be governed under anarchy, but enforcing rights isn’t a necessary problem.