There is one gaping flaw in the " No property is worth a life argument. " that folks who apparently hold the slow loris in high regard tend to use.
So, no property is worth a human life, so at this point we can both agree a human life has a definable value. And that judgements made take this value into account. Fair enough, no combination of things can equal one human life, and the goal here is to keep the scales balanced.
The problem comes in when you realize this means, if any two (or more) people want to kill you, by your own values, you should simply let them if you have the opportunity to save yourself by killing them. And the math works out very simply , one life lost is less than two lives lost, so morally, your decision would have to be to simply lie back and die regardless of the intent of the killers.
See the glaring silliness of this idea? If we are going to say that a human life should have a value placed on it, and actions should take place according to this value, it leads to some rather silly ****.
Thankfully the rest of us work on a different system, "Don't **** with me and i don't **** with you.", and it is by far the superior system. Those who wish to harm others have started a conflict with that person, and it is not the person who starts the conflict who gets to decide when it ends, that goes to the person who did not start the conflict. Don't want to be put in a situation in which this would be a problem? Don't steal things, don't assault people, plain and simple.
If we are going to try and quantify everything in relation to a human life, then we really will have to redo every single law (not to mention many general morals.) to do so. Think of it, self defense laws would have to take into account if you were taking more lives than would be saved if you just let people kill you. But that is the utopia people like this seem to want.
I mean hell, in the grand scheme of things, global politics would have to be completely rejigged as well. Imagine a world in which instead of a country deciding if morally war was worth engaging in , they simply did the math, if it would cost more lives to stop a new evil dictator, just let him take what he wants. After all, nothing is worth even one human life, and those people fighting against him could just give up what he wants , i mean what is their issue?
For **** sake, how would trying to stop genocide in a world ran by this premise work?
" Okay, Rawandan natives, we are going to help you, but you see there is X million of you or so, now we will keep fighting for you unless the total deaths in the war exceed that amount , because once we start going into the red , human life wise, it just doesn't make sense to help you."