Of course but having read some of the reports they get more than enough evidence to connect the two. The issue they had in some cases was the destruction of evidence before the police could get warrants for legitimate gathering of evidence. If and I mean if these rings ever use SAFE network then destruction of evidence is not possible. In other words if they ever use SAFE then there will be an increase (how much is to be seen) in convictions and jail time since there will be more evidence.
But yes the connection of the criminal to the data is always needed and that is up to good old police work.
SAFE is not going to be the haven for criminals where there is a connection to the real world because that leaves a trail to be followed.