Oofta
Legend
They could also be subdued with non-lethal damage. Not my call how you run your campaign's justice system, or lack therein.They aren't going to "come quietly" under any circumstances. Negotiation or death are pretty much the only options available to the PCs. And they are too powerful for "the authorities" to deal with in any case.
As for punishing them, cui bono?
Again, I'm done so I'm not going to reply to you either on this subject, we're just repeating the same things and I don't see the point.