The line that Solas won't cross
I know some people feel that Solas is a hypocrite for using blood magic on Rook, given his feelings about freedom. But as a matter of fact, I think that in both Inquisition and Veilguard Solas is pretty consistent about honoring people's freedom, in the specific sense in which he understands that term.
Here, it's important to remember that Solas' understanding of freedom is strongly influenced by his earlier experiences as a spirit: for him, freedom is about being free to pursue your own purpose. In Inquisition, he repeatedly comments on how being 'twisted against their purpose' is a particularly bad outcome for spirits. And in Veilguard, this is his justification when Felassan asks him about his treatment of the chaos spirits - they died, yes, but they did so while fulfilling their purpose. This shapes his views on freedom for embodied people as well: for example, he hates the Qun because it controls people's thoughts, thus preventing them from formulating and fulfilling purposes of their own.
This understanding of freedom is sacrosanct to Solas, and despite all the morally problematic things he does, this is a line he won't cross: he doesn't twist people against their purposes. Of course we all know that Solas uses people, but he does this in a specific way: he doesn't manipulate people into doing things they don't really want to do, rather, he finds ways to align their purposes with his own.
We see this very clearly in Inquisition. Solas is using the members of the Inquisition to fight Corypheus, yes, but this is something that they already wanted to do. Solas doesn't pressure anybody into acting contrary to their own volitions. And importantly, as soon as Corypheus is defeated, he leaves, because his purpose is no longer aligned with the Inquisition. He could have stayed on and tried to use some of the Inquisition's resources in service of his own cause, but he doesn't do that because it would require twisting the Inquisition members against their own purposes, and that's a thing he will not do.
And strikingly, Solas sticks to the same principles with Rook. He could have used the blood magic connection to try to manipulate Rook into helping him take down the Veil, or to convince Rook that it would be a good idea to release him from the prison. But he doesn't do that; instead he just uses the simulacrum of Varric to encourage Rook to do something they already wanted to do, i.e. fight the Evanuris. Although Solas does deceive Rook, he never twists Rook against their own purpose. And although Solas does ultimately physically imprison Rook, he nonetheless respects their freedom in the sense in which he himself understands that word; he imprisons their body but not their mind, which to him would be a much greater wrong.
I'm not trying to make excuses for Solas' behaviour here. What he does to Rook is hurtful and unkind, and he's too focused on his own understanding of freedom while disregarding the ways that other people might think about this issue. But I do think it's an interesting aspect of Solas' character that he has a clear sense of his own moral code and he sticks to it. People sometimes portray Solas as a person who will do anything and betray anyone in service of his goals, but that isn't really true: there's a line he won't cross, and he's very consistent about that. It's a clever feature of the way he's been written, and I appreciate that consistency!
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