

It’s kind of like how many people are afraid of geese. An angry goose can give significant bruises and is basically impossible for an average person to restrain without killing the goose, so the only option is to run away. Because the easy win of breaking the goose’s neck is not on the table for most people.
The US lost in Afghanistan because the goal was to turn it into a functioning democracy, and the local culture did not support that. If the goal had been “winning”, the Army was entirely capable of slaughtering the large majority of the population and then importing settlers to numerically overwhelm the remnant population. Like our ancestors did to the Native Americans.
If you define failed movements as either “not wars” or “not dedicated”, sure. A recent depressing example I am assuming is definitioned out of your view is Hong Kong, which is firmly under the control of mainland China. A slightly more distant example is Northern Ireland, which is firmly part of Britain.