The existence of these bodies reduces the scope of the problem to merely one of first identifying an appropriate organisation that certifies the product type in

The existence of these bodies reduces the scope of the problem to merely one of first identifying an appropriate organisation that certifies the product type in question, and then ensuring the organisation is legitimate. Do you think it's easier for a consumer to discover and vet certification organisations than it is for them to discover and vet transportation organisations? The price signal you mention is the strongest one, which is why pigovian taxes are often the most effective approach to tackling negative externalities. It's a good example of the sort of government regulation that is many orders of magnitude more effective than individual action.