Recent experience has given me some confidence in Tesla's safety features. A friend offered to let me charge on his shop circuit, which he said was 220V 20A. I duly set the car to 80% of that, 16A. Within two minutes charging stopped. The 20A breaker hadn't flipped, but the UMC had gone red. Inspection showed that the circuit wire couldn't handle more than 16A, and I suppose the UMC detected this. I dialed the car down to 12A and charged overnight without any more problems.
High current is dangerous, full stop. But we have pretty good defense in depth from the car charger setting, the UMC, and the breaker panel.