The death penalty is not cruel and unusual
There are limits to the evils a government can do evens though a person may deserve more. The question is where those limits lie, because death is not a "cruel and unusual punishment," but rather a fitting limit.
"cruel and unusual" simply means morally unjustified and unconscionable. I fail to see that death in electric chair is either"immoral or unconscionable." After all, the criminal has committed a heinous act of violence with "malice aforethought." I would argue that the electric chair, far from being unconscionable, is completely justified.