The more bit coin is used for illegal and harmful trades the worse it is for the future and policy that will be applied to it by governments and banks in the future.
So it's a bad development I think.
You make it seem like money laundering was never being done with fiat money.
Money laundering will always be here to stay its just now easier to move money around since they adapt a new "money transmitter" since thats what bitcoin also serves.
Casinos and other various forms of people forming a LLC like the argentina gambling websites also has "bitcoin accepted".