Your post about obesity doesn't imply it's all about sugar.
One of the reasons obesity is such an issue is because of the combination of sweet and savoury foods that are very calories dense and not very satiating.
Says who?
Go check how much sugar is dissolved in soda, it’s more that a spoonful and ask yourself why? .
The thing is that it's impossible to moderate one's intake as, as you said, it's addictive.