In DeusEx, the Triads fight with all tricks against each other. When J.C. retrieves the Dragon's Tooth from Maggie Chow, suddenly the leaders of the Luminous Path and the Red Arrow become best friends and invite J.C. for a drink. The Dragon's Tooth is vastly helpful for J.C. in particular, but not that a devastating weapon in general, that the atom-bomb effect ("war implies mutual annihilation") would apply.
So, why would that cause such a sudden peace between these old rivals?