There is no real value. The same person who says he values his life will pass in a no passing zone on a hill not knowing if a Semi-truck is coming from the other side.
If 2 Americans a day are killed in Iraq I am deeply disturbed but really don't care about the 40 to 100 Iraquis killed in the same day.
I believe most people value their own life and that of their families but they are all too willing to risk all on the freeway in order to get ahead of another car. And then both vehicles arrive at the same destination about 15 seconds apart.
So the value of a human life is what is put on it in that moment. It varies.