[hef19898]

If you extrapolate Klingon martial culture and capabilities from their traditional weapon, the Bath'let, this in-universe behaviour makes perfect sense!

Edit: For some reason, every non-FTL civization Star Trek just seems to be ignored by everyone. Heck, even the Dominion ignored them in their empire building...

That's authors so: In the Star Wars Legends EU there are the Ssi'ruuk. A species from the edge of the universe harvesting other lifeforms, litterally, for power generation. Throughout the books about them, the fact they could go on a spree of exterminating each and every primitive species they encounter is never mentioned or even hinted at. Nor is the fact, that with a bare 6 systems under their control, and inferior ships and tech, they should be one punitive expedition away from extinction themselves.