Structuring: Often known as "smurfing," it is a method of placement by which cash is broken into smaller deposits of money, used to defeat suspicion of money laundering and to avoid anti-money laundering reporting requirements. A sub-component of this is to use smaller amounts of cash to purchase bearer instruments, such as money orders, and then ultimately deposit those, again in small amounts.[4]
Bitcoin can be considered a "Bearer Instrument".
Oh god, bitcoins are "bearer instruments" and can be used to launder money! OUTLAW THEM!
Oh god, money orders are "bearer instruments" and can be used to launder money! OUTLAW THEM!
Oh god, personal checks are "bearer instruments" and can be used to launder money! OUTLAW THEM!
Oh god, gold is a "bearer instrument" and can be used to launder money! OUTLAW IT!
Are you seriously trying to claim that because bitcoin could potentially be used to launder money that simply trading them at an exchange is (or should be) illegal? Good Lord, we'll have to outlaw everything! I could stab someone with my ink pen, better outlaw ink pens!