I can truthfully say that I would rather rehome my cats than ever subject them to declawing.
If I was unable to find a workable solution, and me or others in the home were unwilling to accept this cat behaviour, it would be kinder, imo.. to find kitty a new home, where they can be accepted whole.
As for a death sentence being a solution for the "crime" of it's anatomy and natural instincts, cant imagine that scenario any more than putting a dog to death for digging or barking.
The day cant come soon enough when this abomination is no longer an option period.
And if you took a "kitty poll" on that.. I'm guessing it would be all paws up.