Leo posted a link to an article that brings up some good points to think about.
from article:
America as the world's self-appointed judge, jury and executioner? "We must face the fact," President John F. Kennedy once said, "that the United States is neither omnipotent nor omniscient -- that we are only 6% of the world's population -- that we cannot impose our will upon the other 94% of mankind -- that we cannot right every wrong or reverse each adversity -- and that therefore there cannot be an American solution to every world problem."