by John Green, American Thinker:

Feedback is a fundamental principle of control theory. All systems, regardless of whether they’re technical or social, require negative feedback to maintain predictability and stability. System actions which deviate from those desired must trigger a response which counteracts (rather than reinforces) the deviation. When an automobile begins to accelerate, the cruise control applies negative feedback by reducing the throttle to maintain control. Were it to do otherwise, the car’s behavior would be unpredictable or even catastrophic.