This is still very hard to believe, there is no such thing called honor among thieves, how can an hacker go through a lot to hack a security server just to return the money they stole? This doesn't sound right and I believe that we are only hearing half part of the truth
They are just afraid to get exposed and they are not really criminals because they are tracked, they are not hardened criminals and still have a conscience, but still, they should be prosecuted to give warnings and messages to those who will attempt to hack or steal people's money, networks should beef their security, and hire the best security IT to avoid similar hacking to happen again.