Xsauce, I shall read it... when I'm over my fic block. But you rock for writing it!
Dredging up the previous topic of conversation (that was had while I was blissfully unconscious, aka sleeping):
It's a capital punishment argument. It's going to be hotly debated, regardless of which side of the morality you play. I'm just surprised it too you guys three pages of discussion to say it

And while all of that was wonderfully put out in excruciating detail as to why you'd be an evil person to let Garrus kill Sid, /shrug I do it. Every time.
I don't let him do it until Sid's explained the whole thing (which BTW Coll, Sid never mentions anything about a family, it's just him. "They got to me." That's all he says.) but I still let him do right by his whole team. The ten men who are dead have their killer brought to justice, and the last man asks for oblivion, and gets it.
Because no where in the conversation does Sidonus say what he did was wrong, I don't think he's redeemable.
But, that's just my opinion.
Other's may vary.
As for Garrus going off the deep end, eh... I can and can't see it. I mean, if you play straight Renegade, the galaxy hasn't b!tchslapped Shepard back into oblivion for all s/he's done, so I don't think the same would happen for him. But I don't want to speculate too far ahead. Simply 'cause I'd like to be surprised with what BW does.
They've so far no screwed up any character I've seen so far (and before any Liara/Kaiden/Ash-ites scream foul, wait a tic) so the end of this trilogy should be epic in the extreme.
Though I agree with Raga: if all we get for Gar is a DLC and then sweeping changes come in ME3.... /foamyrage