Shalom is equal in value to everything else in the world put together. We see this reflected in our morning prayers. G-d forms light and dark, makes peace and creates everything. First He must make peace. Then He can create everything.
Peace is the foundation upon which everything is created.
Tell me another reason why peace is so great. Idol worship is one of the worst sins. Yet if there is shalom among the Jewish people, G-d will not punish them severely for idol worship. Shalom can fend off the worst punishment. I want to hear more.