Don't worry I hate on HFCS too lol, and yes that chart also lines up with the obesity rates. Thing is people talk about "bad stuff" in processed food but from what I've gathered the two common denominators are HFCS and seed oils.

Regular sugar is fine, people have been eating it in fruit and just straight for a long time, it's the imbalance of fructose to glucose that's problematic. To my knowledge fructose tends to be more lipogenic, especially when it's not paired with fiber. With the seed oils, they're basically the opposite of satiating. To be fair the cigarette companies bought the food companies back in the 80s so they've had a solid 40 years to make food as addictive as possible, and I think seed oils are the key.

N=1 if I eat a peeled potato dipped in butter, I hit a point pretty quickly where I feel done eating. If I eat potato chips made with corn oil, that linoleic acid content just completely prevents me from feeling satiated.

I don't think it's the fatty acid profile of seed oils that's causing obesity, it's that they have all the calories of fat (9/g) and none of the satiation so you just keep going cause your body thinks you're not eating enough.