Buying drugs online almost certainly funds criminal acts. Some of the most vicious gangs in Europe traffic “mild” drugs like Ecstasy, Ketamine and marijuana. Denying this is to be profoundly dishonest with one’s self.

In most jurisdictions buying drugs is a criminal act, or why would you buying them online? If you commit a crime you are a criminal, by the definition of the word. You can argue about the merits of the law, but it doesn't mean that you've not committed the crime.