I’m curious how does a bad (terrible) “full self driving” car make you realise humans are “really terrible drivers”. I can see how some drivers can miscalculate and end up making a risky manoeuvre. It happens, intentionally or not, and most people can and are willing to react in a way that avoids an collision. A Tesla on the other hand is beyond bad or terrible. It is basically incompetent - driving into on-coming traffic, opposing lanes, deviating wildly from the lane, ignoring speed limits etc).