Why is it that every leader in power seems to forget that they won't stay in that position forever? Let's take his word for it and say the power won't be abused. What of his successors? If a power exists, it will be abused. Period. It's only a matter of time. That's the whole premise behind checks and balances and due process. You don't leave power in the hands of a few, but the many.
Why should he care? He cannot run again. It would be so much better if Presidents only could serve one term, make it six years if you must, but it must be only one term. This way we don't get the unaccountable second term crap we see a lot of.
Because the is the President of the United States of America.