In a survey of ~600 movements since 1900, it was found that those that tended to use violence more succeeded about 25% in achieving their goals, while those that used less violence succeeded over 40%:
* https://global.oup.com/academic/product/civil-resistance-978...
* https://www.goodreads.com/book/show/44096650-civil-resistanc...
You also almost double your odds of success by not using violence. Further, less violent movements are more likely to end up more democratic / less authoritarian.
The/A thesis of the author is that people are turned off by the use of violence/force and are less likely to agree with, and/or get involved in, movements that use violence. So if a movement wants to grow the 'coalition' of people that will help and/or join them, that growth is best achieved by eschewing violence as much as possible.
* https://en.wikipedia.org/wiki/3.5%25_rule
The book is 'minorly academic', but it's an easy read and probably more geared toward the general public.
(The studies/book recognize that "violence" exists on a spectrum. The book also talks about generally non-violent movement(s) that have factions that attach to them that want to use violence, and various other scenarios.)
> A thesis of the author is that people are turned off by the use of violence/force and are less likely to agree with, and/or get involved in, movements that use violence.
It's strange to me that this isn't obviously true to everyone.
I will attempt to find a link when I'm not on my phone, but the methodology and results here have been solidly criticised (mainly around survivorship bias, as a sibling notes, as well as about the measures of success).
This study (and the one about 3% of the population being sufficient to enact a change) comes up constantly when you hang around leftists, and I've been known to quote it myself when I was younger, but it always felt too good to be true and uncomfortably aligned with liberal sensibilities.
Many people, especially in the US today, dont understand that non-violence doesn't mean passivity or even a willingness to compromise. It just means you do anything you can without actually punching and killing people.
And it turns out killing and punching people is sometimes the worst option of to play the long game. This is why nation states often twist themselves in bretzels to manufacture consent so they can go elsewhere and punch and kill people over there. If you don't have that consent, you will lose the popular support and that can mean that even if you won the battle, you lose the war.
Many people fail to consider second order effects. Offensive violent actions to address violent threat may seem like the natural solution, but a second order effect is often that it runs a wedge between the general population and those willing to use violence, shrinking the support. Another second order effect is that the other side will also use more violence and then the whole thing spirals into open weaponized conflict. A thing you should only provoke if you have the numbers, support and means to actually win it. So don't just scratch where it itches, think about the side effects and what psth it leads you down.
Non-violent opposition hinges on the fact thst many of the second order effects are positive. The non-violent side has usually more sympathies within the population, non-violent opposition can be really easy to get into, it could be as simple as a mail man strategically losing a letter, a sysadmin accidentally leaving a api exposed, a wine-mom building networks with others to keep open tabs on the neighbourhood, a peint shop not forgetting who printed a certain flyer when the state authorities show up and so on. Wherever you are, there is probably a way to resist. And if there are enough people normal operations of the regime become hard to sustain.
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> You also almost double your odds of success by not using violence.
Admittedly having not read the 400-page study, I don't think that's a causation that is necessarily supported by the correlation. It would be extremely surprising if the prior of "how likely is this movement to succeed" were not a determining factor in whether a movement tends to use violence, with the a priori less-promising movements being more likely to take violent action.
C.F. the difference between me demanding you give me an apple or your car.