I think it really is Americans like the taste of sugar. Would be interesting to know if other countries are just behind us in ramping up sugar in food or if some sort of legislation is the difference. Really don't see much reason that some descendants of Europeans would have such a taste difference than other descendants.
If adding sugar to your product causes it to sell more then a company is going to do so. If every option for food include sugar then at every price point (including below poverty) then you're going to buy sugared food; but it's not because sugar is negatively priced, it's because it sold better.
The proportion of people who don't have access to a kitchen and a grocery store is far less than the proportion of people consuming too much sugar.
The widespread popularity products with added sugar, such as soda, coffee flavored drinks, sweetened breads (donuts, etc), is by far the bigger factor in overconsumption of sugar.
When these are the only products available to buy, “love” is a bit strong of a word choice I think. Certainly we consume shitloads of sugars— but for a great many of us its all that is available.
I sure do “love” my poor health, enforced by poverty and shit products available to me.