Seven years ago, President Obama made this statement to the nation:

Good evening.  Tonight, I can report to the American people and to the world that the United States has conducted an operation that killed Osama bin Laden, the leader of al Qaeda, and a terrorist who's responsible for the murder of thousands of innocent men, women, and children.

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So Americans understand the costs of war.  Yet as a country, we will never tolerate our security being threatened, nor stand idly by when our people have been killed.  We will be relentless in defense of our citizens and our friends and allies.  We will be true to the values that make us who we are. And on nights like this one, we can say to those families who have lost loved ones to al Qaeda's terror:  Justice has been done.

According to the leader most widely and highly esteemed by our friends on the political left, there is at least one case of murder where the death of the perpetrator is justice and is "true to the values that make us who we are."

Once that matter of principle is settled, the question of which murderers should be put to death is only a matter of degree.