Earlier quoted context omitted.
Perhaps similar in size, but not in newness (the market needs to sort out fair value), untested exchanges, difficulty of moving money in and out. These are early adopter challenges, but they are also sources of volatility.
Bitcoin's volatility seems to be entirely a function of demand. People buy it because the price is going up. People sell it because they want to take profits or are scared the price is dropping. You'd be crazy to use it right now for legal goods and services. The view of many Bitcoin critics (including myself) that it's horrible as a currency but a massive success as an investment vehicle seems stronger than ever.
you'd be crazy to buy weapons anonymously - especially if your government protects its people from harm by keeping them unarmed
you'd be crazy to trust mathematics more than governments because governments never lie, whereas numbers are made up all the time