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Silk Road = Good.

Many new technologies are first used for marginal or illegal purposes.
People operating on the margins of society are willing to take risks to gain the benefits.

An early use of sailing ships was smuggling and piracy.
An early use of steamboats (on US rivers) was as moving gambling parlors.
An early use of moving pictures was pornography.
An early use of the Internet also was pornography and, later, gambling.

So, if druggies, gamblers, and perverts are using Bitcoin now, that's a good indication of it's usefulness.
They are risk-takers; bless 'em for leading the way and taking the early risks.
The conservative mainstream will catch on in five or twenty years.

Finally, if government attacks and tries to suppress any new technology, then I want to know more about it.
Doesn't mean I'll jump right in, but I will have a careful look at whatever it is.
Where government isn't, that's where I strive to be.
So, while I'm not interested in buying bad drugs, I am pleased to see Bitcoin has value for people who are willing to take risks..