common sense is exactly as it sounds. common, defined as: of or relating to a community at large. this means it is an amalgam of our common goals which include very obvious things, an aversion to injury, not wanting to hurt people we love...
Boil it down and it comes to two things.
Impulse controll and decision making.
It has been shown time and time again, both throughout history and in recent history, that in the face of seven or eight or ten zeroes people lose this common sense. Impulse controll whithers. They are immediatly set apart by the fact that they controll so much. so much money, so many resources, so many people. how could they not feel set apart?
When your yearly bonus is counted in the tens or the hundreds of millions of dollars, the issues that dictate 'common' sense become faint echoes of what it might once have been. This is why corporations cannot be trusted to run things. They no longer excersise common sense. They are social deviants.