What's funny about consequentialism, is that it applies a very mathematical approach to judging the morality of an action. While this may be one of the best ways to evaluate it, especially in morally gray scenarios, it is still dependent on the assumption that some things are inherently good while others are bad. It can pit one life against another and come out even, but if morals are truly objective, we'd have to first demonstrate that a life has positive worth, even if we all take that for granted.