The vast majority of the time medicine can only ever help with (acute) symptoms and rarely the underlying cause unless it is something like vaccines or antibiotics.
Medicine has side effects because if there was a free lunch to be obtained from medicine, the human body would have synthesized the medicine directly. Hence medicine is always about making tradeoffs.
When it comes to general health, there is always a causal chain of cause -> primary symptom -> secondary symptom -> tertiary symptom -> ... and a lot of medicine tends to work on the secondary or tertiary symptom.
Pain evolved to be an accurate indicator of damage to encourage you to stop ruining your body and not a punishment.
Just imagine someone trying to lecture a network engineer about how really async bugs should really never be different than bugs you see single-threaded if you use a semaphore. I mean, that's why we have semaphores!
Anyway, the temperatures attained during fevers are at best bacteriostatic (read not helpful in actually treating an infection that would lead you to seek medical care). If you've got evidence-based arguments, happy to counter them. Just please don't evoke 'evolution' to explain your bias-du-jour.
Evolution didn't create the personal computer or build a skyscraper. We're firmly in uncharted territory wrt things our bodies were evolved to deal with. As a great example, human temperature has been going down over time—evolution tells us that must mean we're all more susceptible to getting sick!!! https://med.stanford.edu/news/all-news/2020/01/human-body-te...
I did a fevered research dive last time I had the flu and came to the conclusion that there wasn't really any good evidence that fever is helpful for flu, and I should have few compunctions about suppressing it. (And that most of the situations where fever is really valuable for are ones where in the modern world you should go to a hospital and in the case of a bacterial infection be given antibiotics)