Why is it that people consider obesity to be the most disgusting, unexcusable thing in the world, but turn their heads when it comes to other vices?
Think about it:
An obese person has a vice: eating too much food. This vice is detrimental to their health.
A chain smoker could smoke two packs a day, effectively ruining his lungs. His vice is equally detrimental to is health, and society doesn't label it as disgusting, etc.
The same for alcoholics.
So? What is it about obesity that makes it so much more disgusting than these other health-compromising things?