I don't even use bitcoins. When I first got a 7950 I used it for a while until I had one coin and just said forget because at the time they were worth $20 and I couldn't be bothered. I sold that coin for $180 when the price skyrocketed and haven't bothered with it since.
My point is just that I don't care if some people are using bitcoins to buy some marijuana from one another. Just like I don't care about someone using some government issued paper currency to buy some drugs either. It's just smokescreen to me, no one can say one way or another what the majority of transactions are being done for or with and it's irrelevant. Illegal use of currency is nothing new...
Fun fact, near every single bill in circulation will test positive for traces of cocaine. People will use currencies for illegal means, nothing new here.
I've heard about the cocaine part on USD, it's actually quite interesting. I also agree with you, I don't really care what people use their BTC for. But you should be at least conscious where all this money is coming from.
Say you don't have a BTC (and are not mining it). You pay the miner, who has 1 BTC, $120 USD, for that BTC.
Now, what can you do with it (beyond investing it)? You can buy things with it. But you have to get a seller who's willing to take it. Why should a seller take your BTC, which is a word of mouth currency, with an unpredictable value, versus USD in paypal, which at least doesn't come with the same risks? It's because that seller wants to move something without a USD trace. Can this be quasi-legitimate, as in the case with failing markets such as Cyprus? Yes, but that's a rare case, it's one country out of 200+ in this world. More than likely, it's for an illegitimate purpose.
Now, you offer this seller a BTC, but he also has to get something for that BTC (or else he gave you something with nothing in return). He can trade/sell that BTC to another person for USD, who wants to use it for a purchase elsewhere, or else he's trading it to a person for USD who wants to invest it in the hopes that someone else down the line wants to use that BTC for a purchase. So ultimately, it comes back to the buyer and seller, who needs to use the BTC. Which chances are, aren't going to be for legal sales because BTC has no binding laws behind it.
You have no idea.
The "majority" of USD isn't used for illegitimate transactions?
https://en.wikipedia.org/wiki/Subprime_mortgage_crisis
Possibly not the majority, but enough to put our economy in ruins for a few years.
Bitcoin is accepted at:
reddit
okcupid
wordpress
https://www.bitcoinstore.com/
At least one JEEP dealership
http://libertyblitzkrieg.com/2013/04/17/jeep-dealer-in-kansas-now-accepts-bitcoin/
At least one FORD dealership
http://www.spford.com/
Hundreds of others:
https://www.spendbitcoins.com/places/
Educate yourself and you will discover that bitcoin is used for plenty more than drugs.
Firstly, while the mortgage crisis was terrifying, it wasn't illicit. It's irresponsible spending, not illegal spending.
Secondly, a few legitimate websites, while nice, pales in comparison to the amount that's being moved underground the deep net. You've shown quite a few of legitimate takers. The Silk Road is just a single of illegitimate takers, and it moves millions (USD). How much does okcupid or wordpress actually move in terms of BTC-based transactions? This and that most of the deep-net is undocumented.