If death was really such a terrible punishment for mass murderers etc. why do people kill themselves in prison? Ariel Castro is a prime example, sentenced to his whole life in jail, but prefered to kill himself just a few weeks after starting his sentence. I bet the people who advocate capital...
It creates it's own problems too (kids for cash scandal), although a better route than capital punishment. America has the highest prison population in the world (almost 1% of adults are in prison) and pays the inmates around $2/hr to manufacture goods. It's summed up nicely in this article...
Could we get that in English?
On an unrelated note, studies have found less educated people are more likely to be in favour of capital punishment. Make of that what you will.