What should happen after this horrible situation with United Airlines?

https://tinyurl.com/BadUAL

If you can read the corresponding story it would help, but basically, United Airlines basically beat a man (a doctor who had to see patients the next day) semi unconscious so that he would be forced to give up his seat because of their own problem. This is corporate power using local police to beat the public who did nothing wrong. How can we change this bullshit culture?