yes, obviously I used an exaggerated example, but again, we disagree on the "slavery" concept, and there are also times when killing your friends and family would be the moral thing to do IMO.
for the record, not all the blame lies with the Kholins for this. Slavery seems to have been a thing since loooong before the Kholins rose to power. In fact, as you mentioned, Jasnah makes efforts to reduce slavery. Dalinar gives up his priceless artifact, worth more than small kingdoms (IIRC) in order to save 30ish slaves' lives. I don't think that accepting fabrials going forward and hoping for freedom are contradictory. Obviously, I don't see it as slavery, but I do think that you could accept fabrials as a reality while hoping for freedom.
US slavery was terribly wrong, but that doesn't mean I now hate the Founding Fathers who had slaves. I recognize that, like me, they did some things right and some things wrong. I think the same principle can apply to the Kholins.
the message you portray is certainly tonally messy, but I don't think that's the message being conveyed. Obviously, I don't think the spren are enslaved, but I also tend to lean more toward Frustration's side of spren rights than yours. I think the message is more "each life is valuable, whether it be human, singer, or spren, but each must work and provide value." To say otherwise strikes me as communistic, something to which I am dramatically opposed. humans work and provide value in the form of food, labor, etc. Singers work and provide value in nearly identical ways. Spren cannot work and provide value in such ways, so they must work differently, similarly to how chull cannot work like man or singers, so they provide value in other ways.
I don't see it as compromising on convictions, I see it as changing their opinion when something new is introduced. Changing your opinion when new information becomes available is something I value, and see as good. The Sibling compromises, but they don't totally accept fabrials. That's also something I value. I do think that they will continue to object to things, and that they and Navani will work together to continue to improve the experiences of spren in fabrials.
That's not the stance I take. Again, the Founding Fathers had slaves. Does that make everything they did bad? No. Does it mean I cannot or will not root for our current system of government to prevail over oligarchy or dictatorships? No. It means that I must recognize that good people can do bad things, and that I can separate the crimes from the person. It means I still need to root for the good things they do while being against the bad things.
I'm afraid that we simply have different views on this, and I don't think there's any evidence I could provide to change your mind. If the Sibling said that they weren't subsumed, you could say it's because of basically Stockholm Syndrome, and that's a valid position. At the end of the day, we have different views, and I don't think that yours can truly be proven wrong.
I guess my basic question is this: What would it take to get you to change your mind about spren being subsumed by humans in the Nahel bond?
You can also replace the last part of that question with any other position you hold. I think it's important to consider what it would take to move you from your position, it's something I make certain that I do. For example, if we see that many of Dalinar's good deeds were motivated by bad intents, I think that could make me change my mind on his morality. If he saved Bridge 4 simply to spite Sadeas instead of because he valued their lives and they helped him, that would make me start to question him. It doesn't need to be an exact "this is all the evidence I'd need", just a general concept. If there's nothing that could change your mind, I think that's a dangerous place to be in, for anyone.