Your argument is one of semantics. He is a defender of those who have not deprived others of their right to life. This is the reason why both the word murder and the word kill exist. There is a fundamental difference that you don't appreciate.
Unless there was a death penalty administered due to this, she has not deprived anyone of "life" in the sense suggested. She denied their freedom, and this is a grave injustice, but not one fit for a death penalty. How savage and petty that would be.
What is worth more, 50 years of a single person's life or 10,000 years of many people's lives? If it's really hard to comprehend 50 years of a single person's life how impossible is it to truly understand what 10,000 years of human life is?
If you have 40,000 cases and only say 1/4 of them get falsified and that results in on average one year of wrongful imprisonment you're at 10,000 years.