I wonder how much of this cost is due to government inefficiency and if there are ways it could be reduced while still keeping the system fair.
Unless you consider SCOTUS decisions government inefficiency, there is really little that can be done to reduce the time from sentencing to carrying out the execution. To make matters worse, SCOTUS has come within the proverbial red hair's breadth of hearing an appeal based on the time between sentencing and execution creating a "cruel and unusual" condition. Thank $diety that they decided that because it was happening more often than not it could not be considered unusual.
I do not recall any opinions from SCOTUS regarding consecutive multiple life sentences, but I've not been following that area since retirement.
In my unhumble professional opinion (and I am admitted to the Supreme Court of Virginia, both the Eastern and Western US District Courts for Virginia and the 4th US Circuit Court as an expert witness on corrections management - just so you know several folks thought I knew what I was talking about) the death penalty should be carried out in no more than 60 calendar days from the date of sentencing, and should be both open to public viewing and available for viewing on either on post-prime time commercial or cable public access channels if it is to have any social deterrent effect. Beyond that time period it serves no purpose but to ensure the convicted person is completely and utterly incapacitated from ever commiting a crime again.
So there are the two sides of the question of incarceration and the death penalty - deterrance (pretty much an abject failure) or incapacitation (pretty pricey but effectiveness increases the longer criminals remain locked up).
As for our choir members? There does not seem to be much suggesting habilitation in their past, so rehabilitation looks not to be an achievable goal. There does not seem to be a mental health problem that could be treated into remission if not an outright cure. Assasination in the name of society (as some choose to describe capital punishment) has a low benefit to cost ratio. That pretty much leaves general population starting in a maximum security setting and reduction to medium security level when they get to be about 40 or 45, and then to minimum security after they hit retirement age. Maybe by then we could let them out on supervised community service work gangs - like picking up litter on the highway or painting the insides of schools during summer vacation.
stay safe.
skidmark