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If this kid lived to see 80 which should be a relatively short lifespan 50 years from now, it will cost the taxpayer $6.12 million to house him in a max security prison for life (using average annual cost of max security prison).
The average cost of a death penalty case through execution is $1.26 million.
The only reason the cost of a death penalty case is so high is all the checks and balances, legal fees and measures to prevent the execution of an innocent person.
I'm not saying he should be put to death and I'm not quite sure how anyone could at this point. No witnesses, no videos, no evidence or anything else has been released. However, in crimes in which the person admits guilt or there is clear video of the crime taking place or multiple reliable eye witnesses and testimony combined with other key evidence there is no reason a person being put up for the death penalty shouldn't be drug out the courtroom and executed for a couple bucks, wrapped in garbage bags and buried as cheaply as possible unless the family of the person is willing to pay for funeral expenses.
On the other end of the argument, if prosecutors can't meet a case with exceptional evidence the death penalty shouldn't even be considered.
Not sure where you're getting your numbers from.
To execute or not: A question of cost? - US news - Crime & courts | NBC News
Death Penalty*:*The High Cost of the Death Penalty