User blog comment:Ygrain/EDI and the geth: their purpose in the story?/@comment-4967682-20120729195013

I like to think that you're not supposed to think that organics and synthetics will always kill each other. Why? Because the only person who tells you this is the Catalyst. You know, the villain. In fact, the Catalyst itself is the only example in the series of what it claims to be preventing: a crazy AI that killed its masters and outlived them by a billion years.