In the case of Bitcoin the incentives of the system itself will drive miners to seek out and exploit locales where the externalities are least policed. This is

In the case of Bitcoin the incentives of the system itself will drive miners to seek out and exploit locales where the externalities are least policed. This is part of the design, and everyone who transacts in Bitcoin benefits from this. Therefore the cost of those externalities should be borne by the network in the form of a transaction tax.