You don't see the irony in capital punishment? You have done the most heinous thing possible, killed another human being -- and for this we are going to kill you.
Fewer than 25% of the countries in the world allow it. And we are not in very good company. I don't give a sh__ what other countries do and don't do. If we're such a terrible country, why the hell do people come to live here, and not the other way around? Any parents/adults that literally beat a 3-year old to death should god damn well be put down.
Anyone who doesn't like it can go live somewhere else.