I see this more as a practical/technical question, not a moral one... One could argue trading, endless refreshing, late night alarms are kind of drug as well
Buying drugs remotely ( even with bitcoins) means you have to pick them in person ( home address, po box.. whatever your idea is...) and that means you can get caught really easily... Post office worker discover that there's something suspicious, call the cops and they wait for you when you come to pick the package... Maybe before it was more safe because it wasn't that popular... Nowadays, pfff... Unless you live in some very liberal country you're really playing with fire.
That's why shady business are always done in person with a backup plan
+ lots of people should EDUCATE... bitcoins are far from anonymous... Transaction can easily be connected to your IP and then you're done. As I wrote, true story about a guy here in my hometown... Cops got him within 72h because he thought bitcoins are untraceable. Kinda sad because he actually got 5 or something bitcoins... If he played it right he could get away and live prosperous life...
I believe Sweden has one of the strictest drug policy's in EU.
But still buying the drugs with Bitcoin is safe here. Like if I order something from Deep web I can just type in anyone's address therefore if you get caught buying from DW you can tell the police you didn't order anything and they can't show any evidence of YOU ordering so, therefore, they cant charge you.
I know a lot of friends that have ordered and never got caught in fact I've never heard of anyone getting caught ordering online domestic. They just ship it in a normal envelope vacuum packed so no smell.