Being able to do something illegal and get away with it shows that the currency would even be useful under a tyrannical government.
OK, score one. Good point.
But it's still a very bad idea for bitcoin to be known as the medium of exchange for illegal drugs. It's like painting a bullseye on it and daring Congress to outlaw, regulate or tax it in some very egregious way.
Bitcoin enables freedom. But a lot of lawmakers and policy makers
hate freedom and don't need much excuse to curtail it anyway they can.