Human Supervision
Average government AI engineers removed bugs. The best were tasked with introducing very specific ones.
The desired flaws being impossible to induce without breaking the machine beyond usefulness, engineers (secretly) resorted to manually censoring the results, filtering away their own names, their bosses', and their bosses' bosses' boss from what would have been furiously insistent red flags had the corruption-betrayal detection algorithms been programmed for such emotional nuance.