There are very simple reasons why our system is careening towards disaster:
One is that our system all about getting ahead, standing out, winning, out-competing.
The best way to do that, like any self help book will tell you, is to focus on that goal, your success, above all else.
And so cooperation, compassion, empathy become hindrances.
The higher you climb in a hierarchy the more effectively this pressure will reward those who only care about their success and weed out those who have any other priorities.
So of course the people at the top do not care about the common good or the health of our planet.