Diverseopinions I wouldn't be surprised if ideas were linked to socialist and equality -based beliefs in Europe. A means of doing the Labour Party over there. A way of being enlightened and progressive and better. As Britain changed and took on responsibilities of maintaining a welfare state, people in GB probably thought it was time for a change overseas too.
This is such an example of unconscious orientalism. The west as the leader in a forward progression to the philosophical absolute truths of enlightenment? With the othered oriental / colonised like a child being led to the path of this absolute truth? No agency of their own?
It didn't actually happen like that. Post war the Labour Party in the UK held on to the remaining colonies in order to source cheap commodities for a country that was still rationing food and to secure markets for British goods. India was gone but there was still the African colonies The ground nut scandal, possibly one of the worst colonial projects was in 1953.
As to where the independence movement got their ideas from? They studied western ideas but Sun Yat Sen in China, Ghandi in India and other independence leaders came from rich cultures with philosophies that fed into the enlightenment in the first place. There would have been no enlightenment without the philosophies that emerged from the Middle East and Asia. Confucianism proposes the checks and balances of a democracy. When the students occupied Tiananmen Square they were fulfilling their confucian duty for the literati to bring any failings on the part of the Emperor to meet his responsibilities to the people to their attention. Dend even went down to the square to fulfill his duty to listen. If they failed to react Confucius gave them license to overthrow the Emperor as they did each dynasty giving way to the next, exactly why the CCCP reacted by massacring the students. Sun Yat Sen (and the Tiananmen students) and Ghandi took western ideas but also ideas that had emerged from their own cultures in order to develop a system of governance that would work (or not) in their own historical and cultural context.
It really helps if you try and look at these issues from the perspective of the othered as people with their own agency, history and culture as opposed to our rich tradition of othering. Then try finding any benefits to colonialism.....
Was it really beyond the ability of those who were colonised to develop their own civic societies and adopt the trappings of modernity in the shape of sanitation. railways, hospitals etc.? Without all that exploitation and genocide........