Another way to look at bogus claims that harm the people duped by them is through the lens of evolution. There will always be prey and there will always be predators. In our modern technological world we've defeated many of the selection pressures that hitherto weeded out the weak and the vulnerable; one can regard bogus products and MLM organizations as stepping in to replace the selection pressures of old. It's always sad for the prey animal to be caught and consumed by the predator, but that's basically how all life operates except for phytoplankton - which get eaten, but never do much eating (except of sunlight) themselves.