What do you suppose it is like to be elected president of the United States only to find that your power is restricted to the service of powerful interest groups?
A president who does a good job for the ruling interest groups is paid off with remunerative corporate directorships, outrageous speaking fees, and a lucrative book contract. If he is young when he assumes office, like Bill Clinton and Obama, it means a long life of luxurious leisure.
Why is the US making itself impotent fighting wars that have nothing whatsoever to do with is security, wars that are, in fact, threatening its security?
The answer is that the military/security lobby, the financial gangsters, and AIPAC rule. The American people be damned.