IT is a risky business, but IT should be built with the assumption that all attackers are trusted insiders. The idea of external networks isolated from soft, chewy centers by perimeter defenses died in August 2003. Don’t allow mistaken probability calculations to ruin your defenses. Split passwords would mean stronger background checks and giving no one absolute trust. In prison, most guards don’t carry deadly weapons during the course of the rounds of rounds, and inmates are notoriously hard to break out in the last thing they want is armed.”]
Source: https://www.csoonline.com/article/2634526/let-your-worst-fears-be-your-guide.html