Usually, when some bad guy do something, he requests a payment using Bitcoins. Given that the demanded payment is not common, wouldn't be easy to trace the attackers when they retrieve the money back? Assuming that the bad guy wants to retrieve all the money.
X requests 1000000 BTC.
Y is monitoring all transactions and notice about a payment of 1000000 BTC to
Y reports to all banks about the address
qwerty, as it looks suspicious due to that recent income.
X goes to
Z to withdraw the money, but as
Z knows about that address, it blocks the funds and call the police.