Nice TW, but to wax Gandalfian, "How many die that deserved to live? Can you grant them life? Do not be too eager to deal out death". The thing is this. I'm not against killing per se or else I wouldn't be here, but I am totally against uneccessary killing. If you can't convince me that there wasn't an acceptable and reasonable alternative to dropping the hammer I say no, don't do it. If not, then do what you must. I don't mind a bit of blood on my hands, its just that it should be for damn good reason and because there was no other choice. The decision to execute a prisoner says nothing about what kind of person they are, and everything about what kind of person you are. If it needs to be done, for defense or to deter others, do it. If not, and if there is a reasonable alternative, they're not the only one that will have some 'slainin to do come the Day.
FQ13 who is a bit of a geek, but in this case Tolkien had it right