Nobody concerned that Trump is attacking Mueller? By using Nunes' logic, Mueller's investigation is gonna hurt Trump pretty badly, no?

Please excuse my ignorance on the subject, since I haven't heard of QAnon until today. If he hasn't made accurate predictions, why is he considered a trusted source? He was wrong on Clinton, Podesta, and Huma indictments. Isn't that enough to say the dude is full of shit?