General Discussion

There is no wire connecting a switch to an actuator or mechanism. The "switch" is a sensor that reports its state to the computer, or the computer polls it to check, dozens of times a second (depends on implementation). The computer then decides what to do. It might issue control instructions to a mechanism or change a display or modify some behaviour.

But don't forget the flip side. If the computer detects a dangerous condition, it can take action on its own. Like shut off fuel. Usually drastic action is accompanied by an alarm, but it seems not in this case. However, if software malfunctioned it might have skipped the alarm, depending on how the software is organized. If the software gets corrupted (bad download, cosmic ray, etc), then all bets are off.

Jumping to a conclusion with no evidence when there are plenty of other alternatives is a bit like premature e__lation. Unfortunately, then it settles into some minds and become enmeshed in confirmation-seeking behaviour and confirmation-bias. Let's hope that doesn't happen here.