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But then you are merely equipping the car with emergency equipment, so why not a knife and water filters?

I generally don't find reductio ad absurdum arguments very convincing.

For example: seat belts and air bags add extra cost (a lot more than an AM radio), maybe they should be optional too?

I know you're being sarcastic, but it seems like EVs should probably also come standard with a glass breakage device for fast escape.