"As for the suing those responsible, why waste more money?"
Because criminals should be held responsible for their crimes, and because setting a precedent of disgorgement of illegal gains discourages other fraudsters, that's why.
Those responsible for the losses some have taken here should be barred from future involvement with any security, stripped of their own assets, and if a Judge and Jury sees fit, sent to jail.
I can't imagine why anyone would argue otherwise.