i think jeff sachs nails what's behind america's war mongering foreign (and domestic) policy in this scathing article which begins thusly:
On the surface, US foreign policy seems to be utterly irrational. The US gets into one disastrous war after another -- Afghanistan, Iraq, Syria, Libya, Ukraine, and Gaza. In recent days, the US stands globally isolated in its support of Israel’s genocidal actions against the Palestinians, voting against a UN General Assembly resolution for a Gaza ceasefire...
https://www.commondreams.org/opinion/corruption-of-us-foreign-policy