User blog comment:Ygrain/EDI and the geth: their purpose in the story?/@comment-24174486-20120723182551

"a question I am unable to answer: why are these synthetic entities presented as friendly and trustworthy, if the main theme of the series is supposed to be an inevitable conflict between the organics and synthetics?"

Perhaps it's simply that inevitable conflict between organics and synthetics isn't the main theme of the series. Perhaps the idea and fear of conflict between organics and synthetics are simply just the reasons why the Reapers were created, and EDI and the potential peace between the geth and the quarians are meant to show that the Catalyst can be wrong. Perhaps the Catalyst serves as a symbol of what pessimistic and extremist views towards the idea of racial intolerance can lead to.

Nothing about the original or Extended Cut endings ever gave me any impression that you're meant to agree with the Catalyst's "problem" or that it's meant to be seen as a "main theme" of the series. The idea that organics and synthetics will inevitably fight each other is simply what the Catalyst believes.