The importance of human life, is really relative to the person is evaluating it. It differs from person to person. To me, I value life dearly, because everything which has happened to me is pleasant so far. But to some other people, it may not have been such an enjoyable experience. And in some cases, people change their view of human life, as incidents happen which affects the way they evaluate the importance of their lives. Such as people who experienced near-death, or people who attained freedom after long periods of hardship and torture. These people would definitely view their lives, and those who went through the same experiences, in a different light.