The world presents a theology that explains humans to be nothing more than small particles of matter that evolved without the help of God. In this theory, God does not interact with humans, God does not exist, and we have no immortal soul; we were evolved from the body of an animal, making us no different than the animals.
What purpose in life does an animal serve? The animal serves its own purpose, so humans serve their own purpose, too. No longer are humans called by God to lift up the weak, but we are called to live a game of survival of the fittest. Once we engage in surviving only for ourselves and we start killing off the weak, when does the killing stop? Eventually there can be only one survivor. Without two humans to compare each other against, there can be no such thing as a weaker human because only one exists.
Once everybody is killed off, does that mean the remaining one guy has won, has accomplished what he set out to accomplish? Have you ever lived in isolation? Isolation will make you weak, will make you vulnerable to desperation and depression. Being alone should be the definition of weakness. Without anybody to share life with, life becomes death. That’s why relationships are so important. That’s why Jesus said “Love the Lord God with all your heart and with all your soul and with all your mind. This is the first and greatest commandment. And the second is like it: Love your neighbor as yourself” (Matthew 22:37-39).
When we love our neighbors like we love ourselves, we try to keep them happy. When we love the Lord with all our hearts, what do we do? We do not kill the weak off, but we lift them up and make them strong! (Matthew 26:31-46).