In general I find the ambiguity of intent in sentencing difficult to navigate, especially in violent crime, no one comes to an act of violence with a clear mind unless they are sociopaths, and remember a crime of passion can become premeditated murder in the second it takes to stick the knife in again.
The death penalty isn't a deterrent or justice it is a failed act of terrorism.
All circumstances should be considered but a pre meditated murder where someone kidnaps a Child then rapes and strangles that Child to death deserves to die,this person is no longer any use to him/herself or society and eats up resources,it isn't a failed act of terrorism or revenge its Justice.
However we can always go down the lenient route which is the current one:
SHORT LIST OF MURDERERS RELEASED TO MURDER AGAIN (more if required sadly )
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John McRae -- Michigan/Florida. Life for murder of 8-year-old boy. Pedophile. Paroled 1971. Convicted of another murder of a boy after parole, in Michigan 1998. Charges pending on 2 other counts in Florida.
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John Miller -- California. Killed an infant 1957, convicted of murder, 1958. Paroled 1975. Killed his parents 1975. Life term 1975.
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Michael Lawrence -- Florida. Killed robbery victim. Life term, 1976. Paroled 1985. Killed robbery victim. Condemned 1990.
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Donald Dillbeck -- Florida. Killed policeman in 1979. Escaped from prison in 1990, kidnapped and killed female motorist after escape. Condemned 1991.
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Edward Kennedy -- Florida. Killed motel clerk. Sentenced to Life. Escaped 1981. Killed policeman and male civilian after prison break. Executed 1992.
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Dawud Mu'Min -- Virginia. Killed cab driver in holdup. Sentenced 1973. Escaped 1988. Raped/killed woman 1988. Condemned 1989. Executed 1997.
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Viva Nash -- Utah/Arizona. Two terms of life for murder in Utah, 1978. Escaped in 1982. Murdered again. Condemned in Arizona, 1983.
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Randy Greenawalt -- Escaped from Prison in 1978, while serving a life sentence for a 1974 murder. He then murdered a family of 4 people, shotgunning them to death, including a toddler.
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Norman Parker -- Florida/D.C. Life term in Florida for murder, 1966. Escaped 1978. Life on another count of murder in 1979.
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Winford Stokes -- Missouri. Ruled insane on two counts of murder 1969. Escaped from asylum, 1978. Murdered again. Executed for this murder, 1990.