U'll change ur mind after buying something that is "illegal" from gov's point of view.
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I wont be selling drugs to get bitcoins anyway and if i ever have coin in my posession that was used last year in some cocaine deal on SilkRoad it wont have been me that made that illegal  transaction ,although somehow later i ended up with that same coin .....

Similar to how if i had a dollar in my pocket that could be traced back to a bank robbery in 2004

It certaintly doesnt prove i robbed that bank in 2004 .........