What fucked up ethical system do you have that doesn't start by saying human life is inherently valuable?
It is we who choose to make human life valuable or not. And there are easy to conceive global collapse scenarios such as a global famine where human life has negative value - each additional mouth to feed takes food from everyone else and causes more suffering.
My view on this is that the economic mechanisms of trade and private ownership of capital have done far more to make human life valuable than any system of ethics. One can say the same of technology progress, particularly in agriculture, transportation, and labor saving devices.