Video Game Logic - Gandhi isn't putting up with any more of your b-------.

From the TVTropes page for Ascended Glitch:

In the Civilization series, the early games had an overflow glitch that would cause Gandhi to suddenly become hyper-aggressive after adopting peaceful forms of government. His aggressiveness rating was supposed to drop by 2 upon adopting Democracy, but since it was already 1, it “dropped” to 255.