Clearly your education is lacking. You can't prove a negative. If he didn't do it (and according to his book, it was an error, not an attempt to defraud), you can't prove he didn't do it. You can prove that he did do it, but he admits to it and continued to serve in the SEALS for 20 years afterward. Which is why you shouldn't try to prove something with links to questionable blog sites because conspiracy theories are not evidence. They're someone's opinion which may or may not be based on evidence.