Your analogy is flawed. Bit coin was created as an economic experiment, not solely so people could buy drugs off the Silk Road or anywhere else. The crux of the biscuit here appears to be that you think bit coin was created specifically for nefarious purposes when it was created as an economic experiment. It's much more akin to VHS created and then someone decided to use for CP than your example where it was created with that use in mind.
OK, perhaps I did have some bad intel on the why it was created. I thought I had read that somewhere. Maybe that was why Silk Road was created, rather than Bitcoin? Or maybe neither, but that's why one or the other got "picked up." I can't find the article now (I read it over a year ago.) Anyway, I'm still baffled that Bitcoin is getting any traction in the mainstream. Digital fool's gold.