I am totally for capital punishment just as long as it is given justfully. Also, I personally believe that there are some cases in which the criminal truly deserves to die.
People say that capital punishment is a deterrent.
I do not believe that it has much of an effect on the murderer. I see it as everyone knows that killing is bad. The question is whether or not someone has the guts to do it. As with stealing or cheating, some people will do it just for the hell of it and some would never even think about it. There are just some people out there with more balls.