Why are SO MANY seriously dangerous criminals sentenced to "lifelong imprisonment" instead of the death penalty?

Such as, proven and VERY cruel child molesters, child killers, murderers etc. Just google it...many of them aren't given death penalty. Especially, when women or minors commit HORRIBLE crimes, they're never given death penalty (and I'm a woman saying this), at least the minors who commit VERY serious... show more Such as, proven and VERY cruel child molesters, child killers, murderers etc. Just google it...many of them aren't given death penalty. Especially, when women or minors commit HORRIBLE crimes, they're never given death penalty (and I'm a woman saying this), at least the minors who commit VERY serious crimes deserve lifelong imprisonment, but they're released..that's very unjust (eg., Google the child criminals Thompson and Venables- they're psychopaths not normal kids).

So, why, in first-world countries, do serious criminals get a chance to live at all (criminals like, the paedophile who murdered Kelly Anne Bates -- Google it. He still didn't get the death penalty)
Why aren't they sentenced to death (more frequently)?
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