The exercise of law shouldn’t involve emotion, there is a reason why mob justice shouldn’t be a thing.
Of course I would be upset and want the guy dead, mutilated or whatever if it involved someone close to me.
But that’s the thing, dude’s a monster, he should go to jail, and get psychiatric help and be rehabilitated to the best of his capability. If he’s never safe enough to be a free man ever again that’s fine, but in no way he should be killed or mutilated by the state.
But the point isn’t about him specifically, if he gets such a sentence, it sets a precedent that a sentence like this is acceptable for a given crime. And that’s unacceptable on many levels, a state should never have the power to kill or mutilate a person, for any reason, ever.