http://www.morningstaronline.co.uk/a-1ad1-Civil-resistance-can-change-the-world
Why Civil Resistance Works: The Strategic Logic of Nonviolent Conflict, jointly authored by Erica Chenoweth, an assistant professor of government at Wesleyan University, and Maria J Stephan, a strategic planner with the US State Department.
Analysing 323 examples of resistance campaigns and rebellion from 1900 to 2006, Chenoweth and Stephan conclude non-violent campaigns have been twice as successful as violent campaigns in achieving their objectives. They contend that this difference is down to non-violent campaigns being more likely to attract mass support. Non-violent resistance is not a magic wand and does not guarantee success. However, the hard evidence shows it generally has the strategic edge over violent resistance.
Gene Sharp – "If your enemy has massive capacity for violence – and modern governments today have massive capacity for violence – why deliberately choose to fight with your enemy's best weapons? They are guaranteed to win, almost certainly."