You get paid for what it costs to keep you in the seat and valuable. They get paid $100M because they're making decisions affecting >$1B.

The exec's bosses are the board, the people who represent the stock holders, so the exec's compensation is a direct reflection of the incentive the board is giving them. Stock options ensure they look out for that ticker. If the board didn't want short term gains they can always change their mind on the structure of exec compensations.