In my article I forgot her most important point: The power of building movements.
Most people don't even try to change the system because they think it is hopeless.
But, even when people try to change the system, they do so on single issues of immediate interest. What creates change is movements. When Nixon was president, he had to deal with an environmental movement, a civil rights movement, a labor movement, a women's rights movement, an anti-war movement and more.
Despite Nixon's best efforts, he was forced to create the EPA and support other measures more liberal than Obama does now.
She talked about how Rosa Parks was not just a tired seamstress who did not want to give up her seat on the bus one day. She was already an active player in the civil rights movement. And she had even refused to give up her seat on previous occasions. Her action caused change because the movement was already in place and she was already part of that movement.