Here are some essential texts to understand our current situation.
Shakespeare, Titus Andronicus.
Edward Gibbon, The Decline and Fall of the Roman Empire.
Jean Raspail, The Camp of the Saints.
We would need a contemporary Nietzsche to describe the psychology of our condition. No new Nietzsche is available, so the old one will have to do. I recommend Beyond Good and Evil and Thus Spoke Zarathustra as a start.