I always found this to be an interesting question and one no one can really answer without getting their emotions and bias (we are human ourselves after all) involved.
Some people will say that every life is valuable and that even questioning this is wrong. Others are capable of saying that Humanity is so widespread that a human life is so common that it's value is perhaps more valued on what the person is capable of in life, or his/her contribution to the world.
Let's try to look at it as objectively as we can and answer this question for ourselves: what do you think a human life is actually worth? And are some human lives worth more than others?
Edit: Please don't make this about race or culture. Just focus on the human perspective.