You understand their staff needed to be on this flight so that another plane full of passengers in Louisville wouldn't be delayed by not having a flight crew?
So you're saying, unlike doctors, flight staff are demigods and must be given priority because they are irreplaceable?
(The funny thing is, I'm pretty sure United will view their flight crew more as cogs than demigods.)
They had better alternatives: other customers had offered to leave for higher voucher value, I'm sure they could have paid someone already in Louisville 4x overtime. Instead they chose force and intimidation.