What's your view on capitol punishment?

This is a hard one.
While in my heart I feel we should eliminate certain elements from the earth, like murderers, rapists and pedophiles, many systems of 'justice' are too flawed to guarentee we have the right person. Too many people are punished for crimes they did not commit. Its one thing to toss someoen in jail by mistake but to kill them is irreversable.
If we had a perfect system for administering justice I would be all for immediate execution of violent and sexual offences against children for sure.
Murder is a thing that is tricky since so much can happen that could lead up to a death that is not quantifiable in court but I say mass murderers/ serial killers should go for sure.