It's attitudes like that by that writer (and my sister holds the same view), and the govt. using drones to kill people including Americans, and the Obamacare "death panels" (govt. deciding if you're not worth it to society to receive potentially life-saving healthcare), and the mandate that your doctor must talk to you when you're old and sickly about throwing in the towel, that have made this Right-winger and long-time death penalty proponent abandon that, as too dangerous a precedent.
On top of this around here the police just shoot you if you look at them wrong, and they shoot to kill. And the news media dutifully announces in each incident that they had no choice and were forced to do it and justified, and then that news report ends with no facts or reasoning for the justification. I.e. we're not supposed to question, and eerily no one does.
Combine that with all the violence and death that the Leftie Hollywood has churned out for decades (betcha the Dems won't ban guns in movies!) and we have a culture of death, where all kinds of killings and more kinds of them over time are considered "justified".
Unfortunately it's prolly only going to get worse, as an economy with a Leftie boot on its neck can't support people with jobs, and govt.'s going broke can't support people with welfare, so our collectivist overlords will feel the need to do something [famous Leftie credo (and example of typical logic): "Anything's better than nothing!"] to protect the system/the society (since the collective and not individuals is what is sacred).