Should the death penalty be used to punish violent criminals?

Should the death penalty be used to punish ? Well , no I don't think the death penalty is a good thing because I just don't like that and wouldn't want that to happened. I don't think it would be a good to do that. Yes, even if they did a big crime but at least just give the criminals punishments and jobs or anything that would change the criminal. Family of the criminal wouldn't want that to happened and I will seriously feel bad. I have a heart and I care for others so that's why I don't think that would be a good idea to have the death penalty for the criminals.
So I'm against it , maybe to others it would somehow be good to use the death penalty against the criminals because the crime the criminal did is so big their worried if it were to happen again. Other than that I don't think It would be very good to do that because It's also a big sin to do that even If the person did the big crime. Let the crime person sin but to do the death penalty to the criminals will might as well make u sin too.