The first step to genocide is dehumanizing your opponent. They are not individuals: they are Huns, Beasts, Gooks, Commies...undifferentiated and guilty biologically or culturally. They are terrorists. Even the three year olds. This violence is discursive.
"These people only understand one thing." They are animals, to be rewarded or punished, a pet or a kick. The resistance of a few results in arbitrary communal punishment. All are guilty. My Lai. Soweto. Belfast. Darfur. Guernica. Gaza.
In 1980, the US was a steadfast supporter of Apartheid South Africa. By 1990, nearly all support for that regime had disappeared, at least officially (with notable exception Dick Cheney) -- with the Cold War all but won, South Africa was more a millstone than a keystone to its Western patrons.
Strange things happen.
When you go to fight monsters, take care that you don't become one. Nietzsche said that.