Mutant probably cares about confirmed humans as much as the rest of the town, but he wouldn't be concerned about it like the lizard would be.
As for your crumbs, Maniac, unless someone was specifically looking for them under the assumption that your cop, and they knew UK TV shows, then, your slip aside, I don't think it was nearly so obvious as you made it out to be that you are the secret agent. All that said, you'd have to be one REALLY devious scum to open the game with little detective references. I did notice the Tennant reference, but since you were calling for protection, I didn't make anything of it.
I think I have to agree with ghug about doc and vig moves, even if maniac is blocked, it might be worth having the confirmed human around, but doc might be in danger too. So, doc should absolutely make his own call.
Would there be any benefit to the vig holding his shot tonight as opposed to firing at a suspected mutant?