While I get that, all of the choices accept the premise that the Catalyst proposes. It admits it's own logic is flawed, but then refuses to call off the attack, instead offering three choices that are all unnecessary. Because he Cafalyst is the one holding all of the cards and won't take the most logical resolution - peace - then the very faulty nature of the reason given is hugely important to the conversation, even if it is just his opinion.
But on top of that, while you say Obsidian hops up on a soap box, I think Bioware practically hopped on top of a soap monolith. The further you steer into the logic of the Catalyst, the better the endings outcomes are. Destroy results in suicidal genocide (if you believe AI's can be considered living and/or if you had low EMS and Earth was destroyed), while Control results in ultimate peace and security, while Synthesis is portrayed as a Garden of Eden outcome.
This was slightly obfuscated in the original endings, where it could be possible that the Catalsyt was tricking Shephard and that things may have been quite dark )hence the Indoctrination Theory's beginnings) but the EC shows us that, indeed, these scenarios do seem to be the rosey outcomes the Catalsyt described them to be and not some form of enslavement or bait and switch.
"AI and organics can't live side by side without eventual war and extermination." That's the Catalyst's idea. The options he gives are "wipe out our entire system, killing part of yourself in the process, and risk starting the cycle all over again," "take over my role and control the Reapers, acting as galactic police and ensuring AIs (or anyone for that matter) never rise up," or "separate the distinction between organics and synthetics and usher in a new era of tranquility and peace for the entire galaxy."
If you reject the Catalyst's idea, then all of these options seem beyond pointless. There's no need for everyone to die - just stop attacking and we can work this out. And there's no need to fuse everyone into a new form of biology against their will - we can see if that's something people want to do themselves. And let's not just murder not only the Geth, but also the hundreds of millions of years of culture, identity and knowledge that have been harvested by the Reaper cycle.
Let's all just mellow out and stop trying to kill each other and that way, we can let the Galaxy decide what we want to do, instead of one person and a psychotic hologram. But since the Catalyst holds all of the cards, you HAVE to buy into his crazy house of twisted mirrors, even just a little, to do anything other than Refuse... which gains absolutely nothing except guaranteed extinction.
I disagree that all accept the Catalyst's logic. I'll point out that when talking to the Catalyst, the Catalyst goes out of its way to dissuade you from picking Destroy (I'm not sure about Control).
And I feel obliged to make the point that I made many times 1.5 years ago:
Genocide: "the deliberate killing of people who belong to a particular racial, political, or cultural group"
Destroy is not genocide, and never was. The synthetics dying is a side effect, not intentional--in fact, I would call it incidental. Because of that (and because the galaxy is yet still in a place to create synthetics immediately), I cannot at all agree that this acquiesces to the Catalyst's logic. This is a direct defiance: to destroy his "cops," as you put it, and allow the galaxy to grow without artificial bounds. Again--the synthetics dying is not the reason, it is an unfortunate byproduct. It is the price you pay for freedom ("can you bear the sin of our salvation?").
I really can't speak to Control very much, but it seems like it's ignoring the logic: becoming the Reapers is a separate issue from whether synths and orgs can coexist. You can apply it to the conflict, but it isn't intrinsically related.
Synthesis is of course agreeing with the Catalyst and following its logic.
And really, the less said about the EC the better. It ruined a number of things, and the only clarification it provided was either heavyhanded (voiceover by Hackett, slides), or actually changed content (the Relays being dismantled) for the worse.
I find this BF hard to use sometimes for in-depth responses, but I'll try to do this without being cumbersome:
The options he gives are "wipe out our entire system, killing part of yourself in the process, and risk starting the cycle all over again,
Wrong. This is actually, "destroy the Reapers, allow synthetics and organics to attempt peace without the Catalyst's interference. Forever. Be free of the Reapers forever." You're looking at it from the Catalyst's point of view, but its point of view isn't reality.
take over my role and control the Reapers, acting as galactic police and ensuring AIs (or anyone for that matter) never rise up
This has nothing to do with AIs and organics. This is about the Reapers, and the Reapers alone. You can
impose the Synth/Org conflict onto it, but it is not intrinsic. This option is actually "take over the Reapers." That's it.
And I won't even speak to the silliness of Synthesis. but THAT ^^^ is what happens when you reject the Catalyst's logic. These options are not pointless. You just have to look at them the right way.
As for "murdering" the hundreds of years of culture, etc. absorbed by the Reapers--I don't agree. I don't accept that they actually absorb anything. They THINK they do, and thus their logic is fine, but I don't agree that they do, and thus we lose naught from destroying them.
*snip*
Of course, the fact that Control would work so well only shows how wrong the Catalyst's logic is. The solution it arrived at - harvest all organic life before it makes synthetics - worked when it was first created. But the second it had an armada of thousands of Reapers no traditional force could contend with, the best solution was available - stay in the Galaxy and play interstellar squid cop.
That's how Blasto did it. And don't tell me Blasto doesn't know what he's talking about.
The only problem with this is that the Catalyst doesn't really know how to assimilate new information--it was only the Crucible that allowed it any option but "Purge."
I think the only way they can coexist is Shepard turning into God-Shepard!
I think they can coexist without any special thing. I think they can coexist as well as organics can (aka not at all, aka joking maybe sort of).