Fear and euphoria are dominant forces, and fear is many multiples the size of euphoria. Bubbles go up very slowly as euphoria builds. Then fear hits, and it comes down very sharply. When I started to look at that, I was sort of intellectually shocked. Contagion is the critical phenomenon which causes the thing to fall apart.
Amazon is certainly not a perfect company. However, doctors, teachers, engineers, journalists, politicians, and labor unions are also on a continuum of consciousness, and none are perfect either. It is easy to judge and find fault with any company if that is what one's ideological biases wish to see.