A perfect penalty coming out of an imperfect justice system

What do you think of the death penalty now, Justice Scalia? (Leonard Pitts) from the Miami Herald
"The argument against the death penalty will never have the visceral, immediate emotionalism of the argument in favor. It does not satisfy that instinctive human need to make somebody pay — now! — when something bad has been done. Rather, it turns on quieter concerns, issues of inherent racial, class, geographic and gender bias, issues of corner-cutting cops and ineffective counsel, and issues of irrevocability, the fact that, once imposed, death cannot be undone. Those issues were easy for you to ignore in mocking Blackmun. They are always easy to ignore, right up until the moment they are not. This is one of those moments, sir,..."
The predictable outcome when a perfect penalty comes out of an imperfect justice system.