Not voting in an authoritarian military dictatorship masquerading as a democracy is not one such instance, unfortunately.
There is no sufficient loudness of "wake up, sheeple!" that will get the US military to stop waging war (the continuation of which is entirely contrary to the will of the US people). It is an autonomous organization, unaccountable to any branch of the US government, as evidenced over and over again by the lack of resistance to it in the USG, and the lack of consequences for its members when it breaks the law.
The CIA got busted lying to Congress about hacking into Congressional computers to delete evidence of the CIA's torture program. The torture program continues, and nobody is in jail.
Certainly not like turning off a light, but it's a clear fallacy that peoples actions (or inaction) don't change policy and practice.
Put it another way, if Americans aren't responsible for the actions of America, who is? What sort of answers to that don't undermine the entire concept of the country?
The people in the voting booths in the USA can no more be blamed for the USA's warmongering than the Americans who stayed home, abstaining, or people in the next country over. The US military is going to do what the US military is going to do, and to believe anything else is to be either ignorant of history or hopelessly naive.