I guess when you say beneficial to humans, that could also be subjective?
Like we can now say this vitamin or medication has benefits that over weigh the negatives, but this could also be due to full studies might not have been done to prove the other negatives that could come with it. We are just weighing heavily on what we know base on what we have seen or heard.
Also, with the above, as the human genome is different, benefits to one might not be the same to others.
I do reckon, in such situation, an AI not taking a side to be a better approach and prompt the humans to do their own research. I'm also pretty sure this medication example do also applies to other paradigms/areas.