Despite most being heavily divided on capital punishment, it is very challenging finding thoughtful voices supporting death penalty. Josh Marquis, former District Attorney of Clatsop County is a supporter of capital punishment and has written extensively on the topic.
About Joshua Marquis -- https://en.wikipedia.org/wiki/Joshua_Marquis
Joshua Marquis Blog -- https://www.coastda.com/
"The Myth of Innocence" - (2005) -- https://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=7185&context=jclc