It seems that a plausible reason warning alarms would be ignored might be that the driver had a heart attack or stroke while auto-pilot was engaged. In that cas

It seems that a plausible reason warning alarms would be ignored might be that the driver had a heart attack or stroke while auto-pilot was engaged. In that case, disabling all automation might be the worst response to the situation. I'm sure that Tesla engineers have considered this scenario but it certainly makes you realise that this is a hard problem to solve.