User blog comment:Garhdo/Unhappy with the ending? Make your own!/@comment-1786741-20130225182538/@comment-3543731-20130227000743

Actually if you listen to the Catalyst he never actually puts the complete blame on synthetics. He just states that due to philosophical differences between the two clearly different lifeforms, conflict between the two is inevitable (one will want to pick a fight with the other, whether than be synthetics rebelling or organics like the Quarians fearing their creations and wiping them out causing them to retaliate). However the Catalyst believes that if a war were to break out between the two (organics vs. synthetics) synthetics would most likely win (organics build machines to overcome their limitations [both the Catalyst and Mordin in ME2 mention this] so those machines are generally better).

To circumvent this the Catalyst harvests races who have reached a point where they are technologically capable of creating such machines for fear that if left unchecked such creations could wipe out all life. He however leaves lesser races alone so as they could continue to live and thrive until they inevitably reach that point. Also, using the mass relays the Catalyst attempts to use this life as an experiment to see if they can overcome this problem; but throughout time apparently (until we came along) none have been able to do so. And I mean who came blame those results; organics can barely get along with each other let alone a form of life so completely alien from their own (synthetics).

They way I see the OvsS theme is that technology will reach a point that it could systematically wipe us all out easily if misused or abused. This could be biological (biological warfare) or technological (nukes). Thankfully though these types of technology can be somewhat governed and controlled. But how do you control and AI? An, artificial consciousness that can think and act on its own. While peace was made between the Geth and the Quarians that was because you, Shepard, were there. What if you weren't? I'm sure the Quarians would not have survived. And while the geths intentions may not be all malevolent (yet, remember the heretics in ME2? They didn't seem to keen about organics) whose to say another form of AI created by some other race would be so...understanding?

Anyways, sorry for the wall. This is just my thought on the matter.