it is not "pure fructose" - they have different levels but usually it is 50% fructose syrups. Lots of fruits have similar ratios to that too, fructose isn't the problem so much as the quantity of it being ingested, but high quantities are glucose or other sugars are also bad when they come in liquid or otherwise highly digestible and fast absorbing foods. Also sucrose, which is table sugar, is indeed also 50% fructose.