It is odd that the parents would trivialize the event by saying the death of their son and the maiming of their daughter by saying the death penalty would inconvenience them.
"If he gets death, there will be an appeal, and we will have to come back, and come back again. Like, I have to go to the mall. I don't have time for all this stuff."
I myself, would do whatever it takes to make sure that f**ker is dead, dead, dead. I would kill him myself if I had to.
And also, aside from the justice part of it, if he remains alive it will only be a matter of time before some American(s) is capture somewhere to exchange for him. It will happen.
It is like taking off a band-aid, just get it over with now.