@DragonParadox two questions, if you don't mind, regarding world building. We know that in some sense Fate exists in DresdenVerse, or at least in this quest. Seers exist, And we are outside of Fate. So, the questions:
1) How does Free Will coexists with Fate?
2) Can we use the crown to ask "What is the Fate of X person?". Or does this run into our deal with God?
The motivation might be different, but the violation would be there.
My point is more about rhetorical counter play. When up against someone good at social giving openings is dangerous even when they seem to have obvious resolutions.
"Because of X I won't engage with Y"
"It's not X though, are you sure you know what you're talking about?"
We shouldn't set our standard against something that he may be able to disprove, even in part, because that presents an opportunity to steal momentum on the argument as a whole. In a purely logical sense it doesn't make a difference, but people are not perfectly rational actors.
It's like if I tried to argue that man made climate change happens because space gremlins are attracted to CO2 and they radiate enough body heat to warm the globe.
Man made climate change is happening and we as a global community should get our CO2/pollutant emissions under control, but anyone who wants to argue otherwise doesn't have to engage in a discussion about the real points. They can derail into my space gremlins nonsense and make the conversation about something they can win then try to keep it there.
If I was Marcus my tactic in reply to this would be to dig at Harry's understanding of the laws and where they fail. Self defense for the first being an obvious place to start. Get Harry to accept he made a bad call about one law, and really given that he knows there's an exception to another maybe others have them as well.
All of which is basically a shell game to shake him and distract from my attempts to get him to slip even a little while standing on the edge of a cliff.
Hell, if time magic is involved it still might work should Harry make it the point of contention. An exception just this once as a little sacrifice for
his little girl - who might die for the sin of being her father's daughter.
How could a law forbid that and still be called just? What god could punish you and not rightly be called tyrant? Why even practice magic at all if not to change the way things are?