Where do I get the statistics that violent crime goes down in a state after the death penalty is reinstated? The department of justice, it has shown that several times. The first published under Meese (unsure of spelling), but has been repeated at least twice.
Your argument that life without parole is the answer, it is used in the vast number of cases. And I don't know of a case where it wasn't offered by the prosecution.
I have been the spiritual advisor in the room with a man as the execution was performed. And while it is beyond emotionally gut wrenching, I also can still support it. That one death woke up others who were headed down a similar path. And they didn't end up the same way, and their potential victims didn't end up dead either.
But those people don't fit in the potential 4%, guess they aren't innocent people too.