People who don't read manuals put themselves at risk.
Even simple systems like Cruise Control carry plenty of warnings that one should be familiar with when operating (from Ford's manual):
WARNING: Always pay close attention to changing road conditions when using adaptive cruise control. The system does not replace attentive driving. Failing to pay attention to the road may result in a crash, serious injury or death. WARNING: Adaptive cruise control may not detect stationary or slow moving vehicles below 6 mph (10 km/h). WARNING: Do not use adaptive cruise control on winding roads, in heavy traffic or when the road surface is slippery. This could result in loss of vehicle control, serious injury or death. [and few more, shortened for brevity]