Or maybe, since they evolved on a completely different planet in another part of the galaxy, their physiology is not as easy to explain as "predator without tits" and "predator with tits." They can be different from us, you know...In more than just the face.
Writers seem to have no idea what to do with Predators, so they get hyper-focused on the honor thing and make them into crab-faced Klingons. Then suddenly their entire civilization does nothing but hunt, which is pretty much no civilization. Not that I want to see the Predator version of Dilbert wasting away at an office, but there's no way the entire civilization ONLY hunts. You can't become an interstellar species with a caveman intellect. And FTL ships would require an energy source. That requires an infrastructure, economy, etc.
Transmitted from Zeta Reticuli.