First, re-read the comment you're replying to. They weren't talking about Bitcoin being used for drugs, they compared Bitcoin to drugs and crime, as the OP said all it needs to do is fulfill a need.

Second, the "you just don't understand it" argument is as old as Bitcoin itself. It's tiring. It's not new, it's not crazy complex...it's understood. It's just useless and ripe with scams.