The point isn't just that it would happen, it's that it would be rewarded and encouraged, and ethics preventing the most profitable action (murder) would lead t

The point isn't just that it would happen, it's that it would be rewarded and encouraged, and ethics preventing the most profitable action (murder) would lead to being outcompeted by an organization with a structure that allows its members to coordinate and profit from murder without their ethics preventing such action. i.e. the market will ruthlessly optimize ethics out of decision-making.