Honestly, I think it’s more of a practical matter. Even if they didn’t have explicit pardon power, whoever’s in charge of the executive has effective pardon powers by simply denying to carry out the orders of the court (see Jackson’s behavior which lead to the trail of tears).

At least by making it official it’s a lot more clear what’s going on, and maybe they had hoped this would lead to electoral consequences for those who abused it?

!To be honest, I kind of wish they just hadn’t bothered with portraying the ending. They set up such cool lore, and I didn’t really need the avant-garde film at the end. A cut to credits would’ve been fine.!<