the average person using bitcoins to buy drugs isn't going to be filling out some shitty survey especially via a fucking google doc link. Only those with small minds IGNORE the black market aspect
I for one don't ignore it. I think it's way over rated.
I don't take drugs and never used silkroad, but I think that people generally will have a positive idea of it in the long run.
You cannot fight drug use by force. There should be a legitimate non-profit organization providing "clean" drugs, proper therapies, and activities for the drug addicts. Legalizing weed will be a step in the right direction.
That way you would kill the black market, the related corruption, and the exposure to unsafe substances immediately.