I agree with most of your points.
I think that the rental car company should have given a list to the customer and they should have shown the supplies (I do not assume that they didnīt). The company should be able to offer explanations. I consider this reasonable service.
But from that point on the person is reponsible for himself. There should be no need for new regulations.

Quote:
Does anybody really believe that these warnings do any good?

Actually they are good for a laugh and a who-finds-the-dumbest-warning contest. My favorite is "warning sharp blade" on a knife.
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If it isnīt broken, it doesnīt have enough features yet.