Ardrey, who wrote extensively on man's social evolution, might have argued that young people like Harris and Klebold choose to hop out of the big pool after detecting the advantages of membership in a small group nonetheless large enough to meet basic needs.
Individual members find their rank among the gang's relatively small number.
The gang establishes territory, even if in school building recesses not desired by others. The gang establishes a moral code and lists of cools and uncools. In assault and larceny, the gang and its members enjoy the blood and loot of the predator. And if he is caught by that larger society against which he offends, and for which he holds the most knowing, cynical and deserved disrespect, then follows the last, vast irony. He will be excused.