Would you share the information you collected with the other people he defrauded? How?
A great many people were defrauded by @zeartul, and I don't think @fortified has an obligation to @zeartul to conceal his identity while helping those people get their money back, or at least to know who took it.
To hold back that information from folks that you know were defrauded could be considered a crime itself: misprision of a felony.
Given this is a criminal matter on a decentralized blockchain where the community is supposed to resolve issues without centralized powers, this is the only solution.