Outside the camp there were dangers of wild animals and dangers of enemies. And outside the camp was where the unclean animals and refuse were to be buried. So outside the camp there was potential danger and the risk of uncleanness. The camp was comfortable and safe and clean and sacred. It represents at least the priority of evangelism and world missions.
Drug dealers are outside the camp.
Pimps and prostitutes are outside the camp. Unpredictable gangs are outside the camp. Your unbelieving colleague or neighbor or classmate is outside the camp. And outside the camp are all the unreached peoples of the world. The light should shine in the dark.