It's the obeast mentality. They think it's a quick fix that requires little to no effort on their part... just count backwards from 100 and wake up on the path to skinnytown! They don't realize it's fucking SURGERY and that they have to follow post-operative instructions extremely carefully. They don't realize they could actually die, on the table or afterwards. Do they have a good, informative consult with their surgeon? Do they ask questions, or talk about risks and complications? Unlikely. They probably just think bariatric surgery is a "GET OUT OF FAT FREE" card.