Fruits also contain a lot of hard-to-digest fibers. Both the fructose and the fibers taken together are fine.
It's when you refine the fruit (e.g. juice it) that you separate the fiber away and therefore loose the counterbalance. The fiber and relative inconvenience in consuming the fruit also help to regulate the intake. Contrast a tall glass of orange juice, which is about 4-5 oranges minus their fiber, with manually pealing and eating that same number of oranges. One can be gulped under a minute, or maybe a few minutes if you drink it slowly, the other will take quite a while to eat and leave you with a feeling of being full.
That's why if I'm offered juice, I try to sip it slowly.
Not sure if satire or not, but plenty of naturally occuring things which existed for millions of years are bad for human beings. Poisonous plants for are an example.
https://paleoleap.com/10-reasons-why-fructose-is-bad/