Really? You are asking a paranoid conspiracy theorist to explain his logic ?
Let's see, a low life who had nothing better to do would create whole bunch of fake identities in order to support his point of view in some online forum, because, well, he has nothing else to do. And this virtual existence would be so important to this loser that he would do anything to support his own outrageous claims, including accusing others of being fake
He wouldn't mind to write in the same forum the same nonsense over and over again for years as long as people are willing to listen to him. That would be his only way to keep his ego happy, because quite honestly, he has little else going on for him.
Or, he just wants to disinform people so they risk and possibly lose their chance of a lifetime. Maybe he wants to have more visa numbers available for his kind.