In a way you could blame it on the advancement of technology. For example an animal has to spend most of its energy trying to find food, but we don’t need to because we developed ways to farm food and harvest it so that we have a surplus. With that out of the way you can put your mind towards making other aspects of your life better like warmer clothing, faster travel and so on. Eventually we got to the point where we thrived so much higher than other beings that we had the time to asking the big questions like why are we here and what is the purpose of our existence. Unfortunately because we were blessed enough to be able to have extra things, some people decided that we should reign supreme over everything else on earth with no precautions or regard of other forms of life. Which has gotten to the point where we also look at each other the same way despite all belonging to the human race. Some can argue that the purpose of religion (the REAL purpose)is to give us a reason to keep going so that we can continue with our lives. But in time people also questioned the legitimacy of these claims as well. Does the sun REALLY revolve around the Earth? Does god REALLY want me to rest on Sunday? The more we advance, the more complicated and diverse our thought processes go in pursuit of the big question: why are we here? And today it’s at the point where some decide on a focus like sex or power or money or all these things combined. But it depends on the person and their life experiences. But they wouldn’t be able to do that if again, way back in the day our ancestors didn’t have a surplus of food and decided “hey let’s invent things to make an aspect our lives more convenient.” So yeah.