question: how much is a human life worth?

my biggest problem with the current administration is the lack of uniformity on the issue of the value of a life. a strait life is more than a gay life (at their quality of life), an israeli life is worth more than a palestinian life, and an american life is worth much much more than an iraqi, or really, arab life. i'll concede that bush's concern with american lives should be very pressing, as he is the president, but then he places his agenda before american lives. so my question is, what is a life worth?