Consider any organization, corporation, bureaucracy, etc. Most start out with noble intentions but badness slowly accumulates as more people play a role. Maybe organization itself isn't so bad, provided limits on its size and term are established. Random wonderings pooling in my mind. Shoot me down, folks.
People are bad by nature, which is why badness comes so easily.
If we were good by nature, the whole scenario would be the other way around. Pride is the killer because it deceives ourselves into disbelieving our own propensity toward deception.