>That's probably because we have yet to discover any universal moral standards

This argument has always seemed obviously false to me. You're sure acting like theres a moral truth - or do you claim your life is unguided and random? Did you flip your hitler/pope coin today and act accordingly? Play Russian roulette a couple times because what's the difference?

Life has value; the rest is derivative. How exactly to maximize life and it's quality in every scenario are not always clear, but the foundational moral is.