Except that we all need to keep in mind that Jim Crow grew out of the idea that government should enact laws to regulate private behavior by individuals and private companies. That much hasn't changed. What has changed is who and what the laws are directed at.
Some of the earliest back-of-the bus laws were enacted in Savannah Georgia and were largely ignored by the private bus companies that provided public transportation and whose customers were mostly working class blacks. It wasn't until the local constabulary began arresting bus drivers on these privately owned buses for not forcing blacks to the back seat that the practice became institutionalized.
The object lesson here, boys & girls, is that without the POWER of the police backed up by the courts (which in English means the government) it would have been significantly more difficult for the racists to inflict their vision on the rest of the south. It was a simple case of Money Talks and you-know-what walks because the bus companies were unwilling to jeopardize their primary income regardless of whatever personal feelings that they might have had about blacks and their place in society.
Oh and BTW, before Rosa Parks there was Martha White in Baton Rouge.