The police told the sellers it was going to be used for dodgy shit.
The sellers were too dumb then. If you are using Bitcoin, then automatically you are added to the hit-list created by the bankers. You have to be extremely careful when you are in such a situation.
Yes, they were dumb, but it still seems like a snide tactic, especially when they probably wernt 'money laundering' until the police came along and snared them.