Unfortunately, there is only so much you can do to try protect people from themselves. I once participated in a conference call with a bank customer and several representatives of law enforcement who were trying to convince the customer that he was not going to get his millions from Nigeria. He had already sent over $300,000 and believed if he sent more, he would get his millions. I'm not sure he was ever convinced since I never heard the final outcome. Sometimes greed can be overwhelming and the idea of getting something for nothing (or a fraction of the promised sum) drives people to do crazy things in spite of warnings.
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Politicians are like diapers. They need to be changed often and for the same reason.