Basically, violence in the Middle East started on a significant scale with the collapse of the ecosystem. Natural climate shifts in the area reduced food available and regions that were inhabitable. This resulted in massive population migrations (the Sea People, the Babylonians, etc). As natural resources were depleted and became highly centralised, violence became worse. The collapse of the tin market resulted in Dark Ages for many cultures in the region, where societies imploded catastrophically.
As wealth increased, corruption increased. We know all about a copper merchant in Babylonian times, but it was unusual enough that he wrote a long and rambling letter in cuneiform about it. These sorts of complaints weren't common but increased. Corruption requires chaos, and chaos generates conflict. So this relationship should not be surprising. It's not that corruption causes violence, but corruption and violence have the same cause and are tightly coupled.