If we look back at the manga while chozo were still described as one civilization, there were two key points:

- they were warlike, but now are peaceful and have a mental block

- aging made them unable to reproduce by normal means and use their wings to fly

Raven Beak flies. The wings might just be artificial but there is a possibility that he and by possible extension all Mawkin were just the youngest chozo out there, too young to overcome warlike habits yet.