Is there such a thing as objective morality? If so, how does it work?

Hi all. I just watched a show where people got to speak their mind about the world, and one guy said that he thinks the world was better off with the death penalty. He said he would personally have no problem pulling the lever in order to "do the right thing". In his opinion, once people have crossed a certain line, there's no going back. He also made the point that if you were to punish people with life imprisonment, the world is still paying for someone who has committed such a heinous crime.<br><br>To me this guy was pretty well thought out, and I don't think he's cruel. He was just very matter-of-fact and I don't think he raised his voice once. I got the feeling that he honestly was trying to do the right thing by saying what he said. I imagine that he's read a lot and has done his research about how the world would look with capital punishment. To be clear, I do not think the death penalty is a good idea. It's a discussion for another time, but I think there's too many variables left out of the picture, and there is too much room for error.<br><br>Back to the question. This man truly believed he was doing the right thing, and I believe he was sincere about that. I'm sure that there are people in the world who believe that the death penalty is a horrible idea, and would never be able to go through with it. I don't know how far this thread will go, but I'm interested to know your thoughts on this.