If someone wants to pour money into a crazy scheme, why should our government waste resources to protect them? The website says "The FBI is legally mandated to

If someone wants to pour money into a crazy scheme, why should our government waste resources to protect them? The website says "The FBI is legally mandated to identify victims of federal crimes that it investigates" so I suppose that's the stated reason, but why should they care? If someone was illegally selling securities that they claimed were regulated or audited, or that depositor's funds were FDIC or SPIC insured, certainly law enforcement should step in for the "victims." But why waste FBI manpower in this case? Why not just let "a fool and his money" go anyway they want? (Is it because the stolen money went to fund nefarious things, like North Korea?)