User blog comment:Madax the Shadow/Analysis of the Chozo Memories/@comment-3334642-20170924133652

Well this is kinda... strange.

The 2002 manga states that the Metroids were created by the time when Samus worked in the Federation Police, and by that time the Chozo had abbandoned their warrior ways and became a pacificst race incapable of hurting other life forms (we see this when Gray Voice battles Ridley, he suffers every time he hurt Ridley or Mother Brain).