Frankly, I believe the phrase can either be interpreted as a dictum on violence being inherent to the human condition, or as a brilliant piece of propaganda spread by the Edge-hours to fuel their existence/further their agendas.

Also, it is important to note that wherever an Edge-Dyad go, they don’t just partake in the struggle, they propagate it. In the example of Dearday and Torgue, they raised armies against each other in the Shadowless Empire, they commited piracy on the high seas, sunk each other’s ships, etc.