JayKeeley
Be still, O wand'rer!
IF
you don't want to put the criminal in prison for life because it costs tax dollars
AND
you can't kill them because the death penalty is wrong for whatever reason
THEN
dump them all on a desert island and let them fend for themselves. Provided there is no way they can ever make it back to normal civilization, let them be forgotten and outcast.
The only cost incurred is a one way ticket to the island.
you don't want to put the criminal in prison for life because it costs tax dollars
AND
you can't kill them because the death penalty is wrong for whatever reason
THEN
dump them all on a desert island and let them fend for themselves. Provided there is no way they can ever make it back to normal civilization, let them be forgotten and outcast.
The only cost incurred is a one way ticket to the island.