I think you overestimate the degree to which Americans would care. In order to move Americans you’d need to propagandize through media, but all current media has a vested interest in perpetuating the military industrial complex.

Any attempt to withdraw and dismantle the MIC would lead to thousands of sad stories of the people hurt by its loss. Workers in the weapons factories, rebel groups we’ve propped up, entire economies who depend on the subsidies, etc. the final result would be apathy and finally more of the same. The only thing America can do is continue down the path it’s set for itself, and the only thing intelligent people can do is remove themselves from it to the extent that they can, wait for it to finally devour itself, and hope it doesn’t destroy the rest of the world in its death throes.