I replied to all the nonsense in your Slate post.  I am not real crazy about Josh Marquis, overall, but I agree with his position quoted in Slate.  Here is a re-print of my response in case you missed it.

"I have to agree with most of the decisions and positions of those prosecutors cited in the article.
The US Supreme Court has upheld our Jury system numerous times and our death penalty standards as well.
The number of convicted black people is pretty much equal to the number of black people committing the crimes. And most of those crimes are against other black people, from drive-bys where six year old girls are killed, multiple murders and assaults outside strip joints and gang fights over drugs and prostitution. to just cover this year's Portland crime scene."