I don't see why people think people buying drugs with bitcoins is this awful PR thing against bitcoin, if anything it makes the system that much more robust. If the FBI wanted to they could trace the transaction (look at the silkroad founder) plus how do you think drugs were bought before bitcoin?
I've been talking to my buddy about starting up a little venture capital with bitcoin and I was educating him on just the recent happenings on the market (like when some smaller Africa/Asian countries dumped all their currency into bitcoin) and he responded by saying "well they were desperate". Well what's stopping an actual government from dumping all their currency into any another commodity such as gold or guns?
Also let's be honest here, we all know people who use drugs or maybe have one or twice ourselves, think about the victim here and ask yourself would you rather have a loved one who is struggling with addiction buy from some shady dealer on the street or a vendor on the darkweb who has hundreds of reviews, better quality control and doesn't put you at risk of getting mugged, scammed, shot, etc.