How is this not viable?
If we left other countries alone, except for trade of course, and not interfere for the better or worse then we can simply focus on internal affairs and take care of our own people. If another country attacks us, or a terrorist group that is supported by a nation, we retaliate in kind with the full force of our military against that nation to break it and make sure that it cannot attack us again, then we go back minding our own business, not bothering others, except for exporting and importing goods, and not interfering with their internal politics.
Such as we no longer give any foriegn aid to any nation as well as eliminate favored trade statuses for all nations and give them all the same and equal tariffs and taxes then no one nation can complain about favoritism. Also no one can claim that the US is partial to one nation over another, such as many Middle Eastern nations group us with Israel due to our support to that nation. Support that Israel no longer needs.