Where did he get money for personal security...he' spending other people's cash?
+1
Mark will be sued for his personal wealth
http://www.coindesk.com/mt-gox-lawsuit-target-mark-karpeles-personal-wealth/ if he spends the money now, nothing will be left for the lawsuit.
But, if he were locked up, he would be safe and wouldn't need a bodyguard. If his personal wealth would be seized, he wouldn't be able to spend anything.
I agree that Mark's incarceration is the best solution for everyone, but even if you lock down his money all he need do is prove that the expenses are necessary to defend himself and it disappears. Nevertheless, it is best that he and all of the funds in his control be locked down.
The class action should seek that otherwise it is just waiting in line behind the reorganization effort.
pressure could also be brought to bear on the US Feds to lock down any US funds he may control
All of those outside efforts are good, however it is most important to know where the money is via the blockchain otherwise other exchanges could do the exact same thing.