I'm trying to track down a short story that I read in high school (1989-1993), in English, in the USA. I think the story was in a collection of short stories in a paperback book. I have the vague impression that the book was quite a bit older than that, from the 1970's or 80's, but that's just an impression, I have no specific evidence to believe that.
The story is about a human who is sent to a colony of recently contacted (or conquered) insect people (bee-like aliens) who until very recently fought brutal, bloody wars amongst themselves.
The recently arrived humans had put a stop to the wars, and now the insect people were depressed, as a species. They may have even begun dying out.
The human specialist determined that this particular race of aliens had an innate biological need for war, and, so he convinces (possibly orders?) the local authorities to allow the wars to start again, and the insect people are immediately happy.