The ignorance exhibited in your post is stultifying.

Imagine, for a moment, being one of many souls who are dealt a really crappy genetic hand and spend their ENTIRE lives fighting weight problems. We're not just talking about people who can't resist McJunkFood, but someone who's always had the metabolic rate of a snail. Follow that person through school, college, and into adulthood--see them try a thousand diet and exercise programs, some of which rebound into eating disorders--and then see their lives become further screwed up by diabetes and all the complications that go with it. Finally, tell all those people that we really shouldn't bother treating them; they deserve to die because... well, they're just fat bastards who nobody likes anyway.

Yep, that's compassionate. Hope you never end up with a disease that people routinely blame on "lifestyle choices."