Death Penalty... Happen or not?

A lot of people in America say that the death penalty is a cruel and unusual punishment and a lot of people say that killing one person is not showing America not to kill. In a way that's right because you're killing someone for killing someone but if you think about it.. IF someone you love was murdered and the person who did it just gets a life sentence in jail because that state prohibits the death penalty... That person is still alive getting fed three meals a day they have a roof over their head and they have a bed to sleep. How is that right? How is that fair? I know that doesn't bring your loved one back and it doesn't show people not to kill but how is that person still living and getting fed by the taxpayers fair? To me that also shows people that it's okay to kill because you're still alive and even though you can't see the outside you're still here.. well I know that that was a little extreme but that's just my opinion... My friend's brother was killed by a drive by shooting and the person who was responsible for it is sitting in prison still getting fed, and a roof over his head 5 years later and that's not going to end anytime soon because they outlawed the death sentence in that state, in the meantime my friend and his family have to live with knowing that he is still alive while their son brother loved one is lying in the ground dead. Like I said above no it doesn't bring them back but you know that justice has been served.. yes they say that since the person was caught and sent to jail to where they can't do it again justice has been served. Call me selfish but I don't think it's fair that some of our tax money is going to murderers just to keep them in jail and trying to make them "regret" killing someone. People who killed more than one person BRUTALLY as in Richard Kuklinski and Charles Manson and people part of the Manson Family all got sentenced life in prison when Richard "The Iceman" Kuklinski killed over 200 people and Charles Manson and his "family" brutally murders innocent people.. Both of these people deserved the death penalty and inside died on prison years years years later after their horribly terrifyingly wrong doings. Other killings may not have been as brutally done but they are still murderers which is still NOT OKAY so I just don't understand why the death penalty in some states is not allowed.... tell me what ya'll think..