It’s already fairly stigmatized (not as bad as trans-fats) and its prevalence in sodas, etc. is blamed for kids’ being fat. Of course, I’m not sure sucrose-based Cokes being placed in schools or promoted in giant cups would have worked out much better . . .
Yes, it is in almost everything. It’s rampant even in things that you would think would/should be savory/tangy/spicy (salad dressing, barbecue sauce, etc.). Mind you, it’s long been suspected that the food industry has skewed people toward a sweet tooth, in part because it’s easier to provoke a sugar rush on the taste buds than to invest more in higher quality ingredients.
Everything shady you’ve heard about the Corn State lobbyists/subsidies, the role of Midwestern Senators in encouraging them, and the imported-sugar duties passed for the Fanjul family, could probably be assumed to be largely true.
Jury’s out for me on the metabolic issue. More broadly, I have seen references to research that says any sweetener (even zero calorie stuff) provokes an adverse insulin response.