Yeah it's a silly argument. People buy drugs, criminals use Bitcoin just like criminals use ANY fiat currency. Give monetary value to water and it'll probably be traded for drugs within no time....
Indeed.
Though maybe this is a good reason to have a popular anon alt coin be used heavily in the drug market scene, allowing bitcoin to appeal more to the mainstream (yet still easily traded for other alts). Allows for less arguments against bitcoin directly.
That would be subjugating Bitcoin to the silly argument and is totally wrong. We don't need to market Bitcoin to idiotic statist control freaks. People need to think free again. It's impossible to root out all evil. Bitcoin is neutral technology and is beyond moral judgement.
ya.ya.yo!