death pen

ian huntley,ian brady,peter sutcliff to name a few. there must be a thousand of these lost causes locked away in our prisons. rapists, murderers, child molesters.what benefit are they to out society?it costs the tax payer £100,000pa to keep an eye on just one of these scum bags. i will personally volunteer to put a bullet through their brains. the only benefit i can see, is some macabre voyeurism, but whom does that benefit