It's the government trying to enforce their opinion of who should own those Bitcoins, thereby taking power away from the owner that the network has decided on, which would be "whoever has the cryptographic keys".
And if you're released from prison and recover your Bitcoin, you will be arrested again for contempt of court or a similar charge.
The question is perhaps what is the most one can use and how to do it. Privacy coins probably play a part in this equation.
You maybe could slowly, and methodically convert it out of the privacy coin into a spendable form when needed.
They could have possibly gotten cash from cartels at a steep discount, but that story would probably have ended with a richer cartel and two dead nerds.
Maybe these guys are thinking if you're going to be a criminal, you had better make the juice worth the squeeze. Live large, party extravagantly, and probably just rent everything from hotel rooms to yachts so there's less for the authorities to eventually impound when it catches up to you.