About 15 years ago, the CEO of an airline I was working with felt there were too many unjustified on-board removals (their term for a pax gettin the boot.) We selected several actual events and did video recreations just up to the decision point and then used these in recurrent training to ask the flight attendants whatcha gonna do? And followed that up with what actually happened - the pax being removed. As I recall one was snarky comments and profanity, another was an overhead bin conflict, and several others. This was a good program and helped to center the needle and not being spring loaded to eject someone. Back then of course, no video recording, normally no litigation, and no media coverage.
We also did a similar program for brand new captains facing them with customer relations problems and training for how to make a good decision instead of jumping to conclusions. This included examples of how to deal with a flight attendant in your face demanding that someone be removed from the aircraft and/or a return to the gate while taxiing out for departure.