There is greed. But there is also a process mistake which made it possible: building the system in a way that the left-side dog was able to rig the system through intimidation. Here, the process failed. Imagine if these animals are separated by say 6 feet, what happened would not have been possible. Of course, cost increases but a more reliable system will emerge.
Lesson: focusing on building corruption-hardened and -resilient institutions where people/firms cannot be like the left-side dog will advance nations like Nigeria than worrying on making sure the dog behaves.
You opened a bank account with no controls and focused on hiring saints when building controls would have made it impossible for the most experienced crook to cheat. Lesson on leadership.