Truck
Quite simply, you're wrong. Moving crews is a priority for the airline. 4 pax bumped or 70 plus cancelled pax pissed because a crew isn't in position, that's just for the first flight missed. It ain't pretty but it's the airline life.
I can say with certainty that the agents didn't want this to end this way, and it didn't for the other 3. That the fourth felt he wasn't subject to getting booted and pushed it to the point of refusing the LEOs order to leave under his own power, well, he deserves blame.