Um, no.
It's about consequences. One should not expect to live if one commits genocide against another.
Anyone who disagrees is a part of the problem...and not the solution. And ye who support the continued existence of mass murderers are an accessory and accomplice to that mass murder.
The "primitive violence" was committed by the perpetrator of the genocide in this case.
Death is the only justice for Nero. Even HE recognized that. So, people whose hearts were bleeding for Nero are wasting that blood...on someone who neither deserved nor asked for it. LOL!!!
Pretty stupid.
What is with this suicidal compulsion to embrace homocidal maniacs -- of both fact and fiction by some people?
What exactly is your ethical position, by the way? Even the most utilitarian of ethicists acknowledge the primacy of rule of law in society and the overriding nature of justice through law over justice through individuals. Why? Because justice through law is formal and (or at least attempts to be) consistent while justice through individuals is patchwork, tainted by perception and emotion, and wholly uneven. Or are you honestly stating that the proto-Germanic blood feud is a superior legal system over civil law?
Furthermore, you are entirely ignoring my point that the Federation are deontologists. They are, an investigation of the entire series, particularly TOS and TNG would show that to be true. They don't think about consequences and cost/benefit so much as the overriding factors of following an ideal because that ideal must or should be preserved. Honestly, if you want a consequentialist and utilitarian view of the world then you are on the wrong fandom. That was never what Trek was about, and most sci-fi series that take such positions to their ultimate end seem almost dystopian.
Finally, you may want to brush up on your communication skills. You have been consistently attributing positions to people that they have never proposed. This is called a "straw man" and it's a poor form of argumentation. None of us have said that we should save Nero or any other mass murdered at the cost of our own lives or we should "let him go". What I have seen, however, were viewpoints that ranged from letting him sink, to arresting him and putting him on trial, and firing on the ship with a better plot and adequately explained circumstances. None of us, and I mean not a single individual, has advocated sacrificing ourselves for his sake or letting him go. Drop the straw man.