Sea Breeze, on a great many pages of the 'Holy' Bible extreme violence, even that which is glorified and mentioned in gory detail. Do you joyfully look forwards to being part of Christ's executional forces (in heaven) during the battle of Armageddon? Do you relish the thought of killing (from heaven) millions of people during Armageddon, in service to Christ and to God? Does it give you an intense thrill to think of killing atheists, non-Christians, homosexuals, lesbians, people who engage in sex outside of marriage, and various other types of people?
Regarding your comment of "... cannot even admit that it would be morally wrong for someone to take your own life?", that is not the case in. Instead I didn't answer the question because I do not wish to let you make me veer off the points i making. I want to stay focused on my message to you.
Furthermore, when you said "Would it help if I put a gun to your head and told you that I just loved killing people?" I did not you were asking me if think it would be immoral for someone to try to murder me (or kill) me? Instead, I thought you sarcastically meant would it help me 'to decide between if all morality should be objective, relative, or subjective?'
Regarding the definition of murder, I am well aware that the dictionary definition of murder is that it is unlawful killing (and the WT also teaches such, and uses the word "murder" instead of "kill" in the 1984 NWT translation of Exodus 20:13). The laws pertaining to when killing is murder and when it is not murder, vary from state to another and from one country to another, and from one century to another. At the Nuremberg trials many Nazis were convicted of having done murders (or crimes against humanity) even though those Nazis were following orders of their government and of their nation's laws. As a result when I contemplate whether a specif killing of humans is murder of not, I don't just consider whether the local human government jurisdiction considers it murder, nor if the Bible says God considers it murder. I also also evaluate the humans laws and the purported laws of Yahweh God, to determine if they are wrong in saying a specific killing is not murder. [Compare that to the biblical account of Lot questioning Yahweh about whether he would destroy the entire city of Sodom if a certain number of people therein were righteous.]