We’re not advocating violence. Your premise is wrong.
But we know our adversaries commonly use violence, so we’re aware it exists, and we know we have to prepare for it.
Are colonialist governments not violent? How do you remove from office a government that commits violence against their people, en masse, to destroy their land with mining operations?
Concrete example: how would the Congolese vote the French out, when anyone organising peacefully against the French is assassinated?
The point is not violence. But it would be naive to ignore the violence of our adversaries.