The reintroduction of wolves into their former native habitats has been shown to have an extremely important positive effect on those formerly wild ecosystems, through what biologists call "trophic cascade".

https://www.britannica.com/science/trophic-cascade

In fact, it's probably wrong to think that a North American ecosystem could ever be fully healthy or even functional without wolves or another top predator.

On the other hand, encounters between wolves and white people in North America are so distorted by white folks' peculiar ignorance, hatred and fear of the wild that reports of wolf attacks should probably be treated, first as iterations of mythology, second, as lies, third misinterpretation of wolf behavior, and only after all that, considered as facts.