We must never use such great thing as Bitcoin to buy awful things like drugs.
This is wrong. Besides, if such story comes up in mass media, the reputation of Bitcoin will be ruined in no time.
Well, drugs can also have different meanings such as drugs as in medicine.
Besides, it's actually no surprise for people to buy drugs using bitcoins, because it's already happened before in a very large scale in the underground market. And regarding that mass media thingy, they've always been only reporting about negative issues on bitcoin such as illegal buying of guns, money laundering, etc.