Atkins v. Virginia

I don't believe in the death penalty but if i did the Atkins vs. virginia case has an exception in my opinion. If a child were to kill someone they would not be sentenced to the death penalty. I think the same should go for a someone like Atkins because they have the mind of a young child. Like a child he does not know any better from what is right and what is wrong. The death penalty is wrong in my opinion all together because it is saying even though killing is not right if someone kills someone it is okay to make an exception to kill them. Also, that person has a family that cares about them. So essentially by using the death penalty two people are dying an two entire families are devastated from a loss.