You have to be a pro-American, anti-abortion, red-blooded Conservative Republican in order for Human Rights Watch to support your execution. Typical liberal thinking.
They also urged President Bush to grant clemency for Timothy McVeigh in June, 2001 on grounds the FBI withheld documents from his defense counsel which led to an unfair prosecution they claimed. They are consistent, we have to give them that.
More typically, human rights organizations along with environmentalist groups, especially any affiliated with the U.N., are just cover groups for anti-American and anti-capitalist activists.