I think the reason why we see the 'fear of rebound weight' is due to the disgusting popularization of super diet/lose weight fast systems. People see pills/workouts/videos/food that will 'make them lose 15 pounds within 1 month!'. But that weight off is not legit, and it's not really tackling the real problem- diet and exercise.
My mom told me she was thinking about taking this pill that could guarantee 10+ pounds off in a short amount of time. I told her she just needs to up her workout intensity and fix her diet a bit (she already works out better than 95% of the U.S. population).
People want the results but they don't want to work for it. It's a total lifestyle change...if you don't want to get the weight back, then continue your workout/good diet habits/etc.