Because it's easy to just drift along with the tide. Even bacteria follow those "economic" laws with regards to replication, food/energy, competition and so on. It takes no effort. And the only thing that keeps bacteria in check is that there is someone above them, limiting them.
We want to be on top, but we don't act with the according responsibility. We can learn this lesson through misery and pain. But this is also how bacteria learn. It'd be sad if we can't do better.
Notice all multicellular organisms exist through their cells implementing such restraint. Cells restrain themselves on function (gene expression) and on replication. When they stop doing that, they revert to pre-organism behavior, and we call it cancer.
We call ourselves a society, but we're only experiencing brief flashes of what this means. Insects like ants and bees are literally better at it, than we are. Lots of work to be done...