The "crash guys" should be able to run up to the car, KNOW that they can "kick at" the disconnect and KILL ALL POWER and that the disconnect will kill the engine as well as get rid of all power in the car
That toggle switch is not gonna do you any good if you are laying there half goofy in the driver seat and likewise that no6, no 4 charging line from battery to alternator makes a fine welding wire if it does not go through the disconnect
You can thank "all that tom foolery" when you are laying there upside down with fuel running down your nose, eh?