Let us converse is secret tongue of assembly, lest those higher language ruffians understand us. While article is somewhat interesting, I feel like it fails to

Let us converse is secret tongue of assembly, lest those higher language ruffians understand us. While article is somewhat interesting, I feel like it fails to emphasize important idea. Secret language is just one part of clan identity. Humans evolved on a planet where being alone is deadly, safety in numbers. We instinctively try to belong to a group. However hunting-gatherer groups needed to stay mobile, so until advent of agriculture no large settlements occurred. When looked at from this angle, secret language is just a sign of belonging to a particular `clan` in the jungle of larger society. So to summarize one of the reasons people develop secret tongues is to establish identity of the clan. And one of the reasons people establish clans is because we evolutionary predisposed to. This is observed quite distinctly in aggressive/highly competitive environments such as prisons/schools/gangs.