I think they prefer to choose denial over attempting to embark on some weight loss program because they are convinced they will fail. Think about it, there are also people who fervently delude themselves into believing the most outrageous concepts ranging from the extreme religious and utterly unscientific. Despite that, I still find this more crazy and delusional than some suicide bomber. We write that guy off as just nuts. What's worse is that it appears there are so many (and a growing number) of these people fervently defending the gloriousness of fatness around us and they have pc supporters backing this shit. Take reddit. You can make fun of black people, homosexuals, etc all over the site. There are even hate subs for that, but fat people? Woah ho ho ho, that's absolutely the most offensive thing in the world.