LOL!
Ok, so fructose is fructose except when it isn't. Got it. What you're also saying then is that honey (where fructose is a free sugar) is dangerous even though people have been consuming it for centuries. Who knew?
The fructose molecule comes in at least two varieties or structures. A left hand and a right hand version which are wound exactly opposite. I'm not an expert but smart enough to know that we've a lot more to learn about how the human digestive process works as well as the affects caused by differences in molecular structures of the foods we consume.
Given the choice between a sweetener occurring naturally or something synthesized by cost conscious folks, I'll stick with natural...