@Kondaru
Poison-
My rebuttal was based on your argument, which centered on the use of poison as an offensive weapon similar to guns and bombs. I considered and discarded the medicinal argument based on SAM's analysis. I will revisit the base and check, but I believe that the poison was being distilled down to a concentration much to high to be used for medicinal purposes other than assisted suicide. Also, please note that only some poisons can be used beneficially in any dose, the rest are just poison. I will count the suicide pill theory as possible, although there is little evidence that such a tool is being used frequently.
Drugs-
Trust Reyes or don't, but when he is in charge if he wanted them gone...
Torture-
You apparently haven't found the torture room out in the Badlands yet. Definitely the Collective, definitely a lot more than a beating. Go find it and get back to me
Vehn Terev-
Vehn Terev is a traitor and a spy and admits it. By the laws of war he can be killed on the spot even outside of pirate colonies. If she didn't kill him she would have to defend him against all of the Angara who would try and do it anyway. Theoretically she could turn him over to Aya, but she doesn't have a map and the local Angara want Aya to But Out (see Kedara intel in Resistance HQ). Her final option is to give him to a representative of a government she is still more or less at war with who shows up and promptly demands she hand him over.
Also, if I deserve to be shot at because my refusal to let Sloane get shot in the back makes me a threat, then someone who has actively collaborated with the Kett is definitely a threat
Note: if a "him" wanted to go in shooting it was probably Kandros not Sloane, as Sloane is a "her". Also, I have not read any Mass Effect novels, but based on the intel around the Nexus Sloane had joined the revolt before it even officially kicked off
Guerilla War-
Every Guerilla organization claims it either is an independent country or government or represents an independent country or government. The size or evident futility of a movement does not have any bearing on the morality of its actions. It is possible to fight a mostly clean guerilla war and win, see American Revolution, WW2 European Resistance groups, etc.
The Collective and the Outcasts pretty much seemed equal military-wise, and I doubt you will find many people who would buy the idea that the Outcasts are vastly more powerful than the Collective.
High Noon/Base-
Robin Hood has never shot the Sherriff in the back in any portrayal I've seen. It's always in the face(/front). I dragged around doing Robin Hood acts with Guy of Gisborne, who then gets huffy when I keep some joker from putting an arrow in the Sherriff's back because Robin Hood is better than that.
I exclusively sided with not letting someone get shot in the back. I have never actively worked against Reyes, and if he was as interested in pragmatism and saving the world from Sloane he'd test my friendship, not try to kill me
Reyes quests-
Yes, Reyes may just be helping solve problems that Sloane is ignoring, or...
Everyone knows the story of David and Goliath. Fewer people know the story of when David grew up, became king, and had an adult son of his own. There are some tough family problems that David handles poorly, but he loves his family and figures they love him back. However, his kid wants to take over and figures the old man must go, so he parks himself outside the gate to David's throne room, and when anyone goes to have the king help them out with a problem the kid grabs them, tells them the king is too busy for them, and offers to solve the problem himself. A bunch of solved problems later he turns his "helpfulness" into an army and goes gunning for Dad.
I feel like somewhere in there is an analogy to Reyes