User blog comment:FirstDrellSpectre/My wishlist about Mass Effect: Andromeda/@comment-25400375-20150719005258/@comment-24200891-20150719053814

That's to consideration. Such aliens wouldn't be a work of nature but a work of science focused on war and devastation. They could be created by scientists for domination and protection, but it went horribly good as those creatures couldn't do anything but murder and devastation. Their makers didn't have time to create a virus to destroy them, so they imprisoned them to keep themselves safe and buy time for next solution. However on devastated worlds the makers couldn't last long, the creators are extinct when the creations still exist.