There is not one answer to "the fat problem" on the Internet. There are approximately a bajillion of them. Many of them are mutually contradictory, many of them appear to have legitimate science backing them up, and many of them have dozens of testimonials by people who have tried Diet X and Exercise Program Y and been turned into lean, sexy people. Most of them have an attractive and charismatic guru expounding the benefits of their program and selling affiliated products. Sound familiar? The PB is not even close to being the only reasonable answer someone could come across, even if they are honestly looking. That doesn't make them morons. It just means they haven't been fortunate enough to find something that works for them yet.
And PB doesn't work for everyone, either! It's not the answer to every problem, and I think it's extremely arrogant to call someone stupid, simply because they may have a harder (or just different!) experience with weight loss than you have.