....why?

the universe is a model of everly increasing complexity, between different sytems that compose it, and their interactions. This complexity has formed the wonderfull complexity of life, and has allowed us to exist. The reason that we exist in life, is because as creatures, more specifically ones with a prefrontal cortex, the experience of existance is euphoric. So recognizing that our lives are precious to us because of our existance, we must also contemplate the existance of others, and how our decisions impact them.