CBGB wrote...
Say you count EDI as a living being.
That poses the most interesting questions about the Synthesis option, though the topic itself offers a good debate, an extension of Dr. Chakwas' argument with Engineer Adams. EDI and Legion share some traits we associate with life - curiosity, self-awareness, adaptation - they lack others: secretion, respiration, expiration. Perhaps even desire.
But if you see EDI as only an advanced machine, the Destroy ending comes at a lesser cost, whatever the merits of Synthesis.
It's when you believe EDI and the geth have the rights of Garrus and Liara that the choice becomes hard, even if you believe Synthetics have empathy. If you Destroy them, you've favored some lives over others, and is that merited when they all possess consciousness?
But if you spare them, what is the cost to organics? The Extended Cut shows all life in harmony, and touts ever-expanding knowledge, but I have to wonder what those peaceful Krogan share with their ancestors beyond a name. Do they still head-butt?
If Synthesis implies an inability to harbor ill-will towards others, it's a fair question whether it allows free will at all. Have you 'killed' Javik and Ashley only to replace them with complacent copies in the same skin? If we overwrite our fighting genes with kinder code, are we still free?
I hate the implication that a free spirit means lasting strife, that to be human, we must always have war. But the Synthesis ending makes me wonder: is perpetual peace unnatural to the point of being un-life-like?
To save EDI, do we have to kill James... and all his kin?
Allow me to give you my thoughts on your OP without having read the rest of the replies in this thread:
First of all, I think it is important to know the limits of what you can know and understand, especially when working with how things are defined. Organic life and synthetic life might share characteristics but they might also have entirely different qualities that are not understood very well, or at all from the other point of view. Someone existing within one existential spectra simple have a hard time understanding those existing in others. If they define something in a dualistic manner within their own spectra (for example: something must be like us or it is not alive/have no higher value/etc) you might run into serious problem of being able to understand the other which transcends your own "configuration"
This is part of the friction between synthetics and organics. Because they only share some qualities, other qualities are hidden from the experience and native understanding of the other.
No doubt organics lack qualities synthetics associate with existence or "life" just as synthetics lacks organic qualities.
The point with synthesis is to bridge the gap between these two different spectra.
As conflict so often is associated with lack of understanding or empathy, the two different groups given insight, understanding, existential contact and appreciation of the other - will be able to avoid misunderstandings, irrational fears and certain conflicts of interest that would have triggered large scale conflicts and wars of extinction. That is the core of the synthesis-plan and no doubt it can also logically be triggered post-control (I am thinking in a voluntary manner instead of the forced synthesis way.
I dislike the message of Destroy because it is a classical story of "us vs them" used by those scary totalitariand ideologies of "racial purity" and "final solutions" involving wiping out the undesirable group". At least it mirrors them pretty well. (Yes, yes, all endings have problems)