The problem with killing people for being violent is that violence is a spectrum with genocide and serial murder on the one end, and snarky comments on the other. Whereas the capital punishment is pretty far towards the killing end of violence.
So when you seek to kill people for being violent, you need to at least specify how violent you need to be. Is killing one person enough? Or maiming multiple? Or just being really snarky for decades?
While "an eye for an eye" seems direct, manslaughter comes in several degrees based on intent and state of mind.
The main reason why capital punishment in the US is preceeded with decades of imprisonment is because killing people "legally" isn't simple.
The only way to simplify killing people is to let go of your humanity.
No.
'Snarky comments' are not violence, that is a silly thing to say, if you are old enough to write you should be aware of that.
Whatever your idea of "least amount of actual violence" is.
The point is: It's a spectrum with very light offenses on the other end.
Imposing death penalty for generic violence shows there's absolutely no understanding of that.
Hard to argue with someone who can only see things from one side.