I think you have an absurd understanding of history if you believe all of this decolonisation happened nonviolently. Almost every independence movement relied on the threat of violence. You are using the civil war itself as the starting point, a brutally violent regime change. Ireland gained its independence from Britain in no insignificant way thanks to violent means. Most African nations gained their independence through violence. And even India was not just freed through a barefoot bespectacled man walking around singing kumbaya. Simplifying it to mere acts of civil disobedience is grossly misrepresenting how complex the situation was.