How does the death penalty rehabilitate anyone?
How is it just? In the United States, ‘racial disparities [in the death penalty] has been evident since colonial times’. Carol Steiker and Jordan Steiker, ‘The American death penalty and the (in)visibility of race’ (2015) 82 U Chic L Rev 243, 243.
Why does saving money deter anything?
You have huge holes in your arguments. Specifically, you haven't produced any reasons to believe them. Some of the responses seem utterly implausible, because apparently we are to rehabilitate the dead. Is this the best we can expect from the anti-abolitionists?