With all due respect, I do not see how the death sentence is sinking to the level of the killer, because murder was a selfish premeditated act of pure evil and cruelty towards an innocent human being(s) and the death sentence is only an attempt to serve justice and get justice for the families of those who lost a loved one.
To me, it is not a matter of whether it deters crimes, it is a matter of justice, and of course it all depends upon how heinous the crime was.
I really do not understand how people can have sympathy towards these kinds of criminals. I guess they have not watched as many Investigation Discovery shows as I have.
There are many family members who never recover from the loss of a child for example and they have to live with that grief for the rest of their lives. Those are the people we should feel sorry for, not the perpetrators.